Most people don’t miss good deals because they’re dumb. They miss them because they take too long.
They open 17 tabs. They start doing “research”. They second guess the price. Then they message the seller two days later and hear the worst sentence in the world.
“Sorry, just sold.”
So yeah. Speed matters.
But speed without a system is just gambling. You’ll convince yourself everything is a deal. Or you’ll get paralyzed and buy nothing. Both are expensive in their own way.
This is the 10 minute filter I use to spot a profitable deal fast. It works for flipping stuff locally, sourcing inventory, even evaluating small business opportunities. The exact details change, but the thinking stays the same.
And the goal is simple.
Not “is this perfect”. Not “what if I negotiate another 3 percent”.
Just.
Is this likely profitable, with a decent margin of safety, and low headache.
Let’s get into it.
The mindset shift that makes this possible
A profitable deal is not the same as a “cheap” deal.
Cheap can be junk. Cheap can be broken. Cheap can sit in your garage for 4 months while you keep telling yourself you’ll list it “this weekend”.
Profitable means you can realistically sell it, in a reasonable time, for meaningfully more than you paid, after costs, after hassle, after the random surprises that always show up.
So the whole method is built around three questions:
1. Can I sell this quickly.
2. For how much, really.
3. What can go wrong, and does the margin cover it.
That’s it.
If you answer those well, you’ll beat most people who rely on vibes.
The 10 minute deal test (with a timer, seriously)
If you want this to work, you have to respect the clock. Set a timer the first few times. It sounds silly but it forces you to stop overthinking.
Here’s the breakdown.
This sounds obvious, but it’s where a lot of mistakes happen.
Is it the exact model or just similar. Is it a bundle or a single item. Is it new, open box, used, refurbished, missing parts.
Get specific. Write down the exact thing:
• Brand
• Model number
• Key specs (size, storage, version, year)
• Condition as stated
• What’s included
If there’s no model number and the photos are vague, that’s already data. Not a deal killer, but it’s risk.
If it’s a marketplace listing and the description is “Works great” with two blurry photos taken in a dark basement. Yeah. Proceed like you might be buying a problem.
Comps means comparable sales. Not listed prices. Not “asking” prices. Actual sales. This is where people lie to themselves.
They search eBay, see a listing for $399, and convince themselves their item is worth $399. Meanwhile the last 10 sold are $210 to $240.
So here’s the rule.
Only trust sold prices.
Depending on what you’re evaluating:
• eBay: filter by Sold and Completed
• Facebook Marketplace: check recently sold if available, or search similar and note how long they’ve been up
• Amazon: more tricky because of fees and condition, but still useful for demand signals • Zillow/Redfin for real estate style deals, again sold not list
• Flippa or Acquire for websites, look at actual closed multiples if you can find them
And you want a tight comp set. Same model, similar condition. If you can’t find exact, go one level broader but become more conservative with your estimate.
While you’re here, answer two things:
1. What’s the realistic selling price.
2. How fast does it move.
Speed matters because time is a cost. Storage is a cost. Attention is a cost.
If you see a bunch of active listings sitting there with price drops, that’s a warning. Even if the price looks good.
Most deals don’t sell at the top comp. They sell at the “someone wants it gone” comp. So I do this quick:
• Take the middle of the sold range.
• Knock off 5 to 15 percent depending on competition and condition. That’s your “real sale price”.
Example.
Sold range: $220 to $250. Most are around $235. You’re selling locally and there are many similar listings. Your real sale price is maybe $210 to $225.
This one step prevents so many bad buys.
Because if the deal only works if you get top dollar, it’s not a deal. It’s a hope.
This is where “profitable” becomes real.
A lot of costs are small individually, but they stack up.
Depending on the type of deal, subtract:
• Platform fees (eBay fees, payment processing, etc)
• Shipping and packaging
• Taxes
• Repairs, cleaning, replacement parts
• Your time, yes your time
• Risk buffer (more on this in a second)
If you’re flipping locally and meeting buyers, include:
• Gas
• Your time for pickup and dropoff
• The chance of no shows
• The chance you have to relist and repost
If you’re evaluating a business deal, costs might be:
• Customer acquisition cost
• Churn
• Tooling and software
• Contractor costs
• Chargebacks, refunds
• Seasonality dips
Same logic.
The fastest way to do it is with a simple formula.
Estimated net profit = Real sale price minus all costs minus purchase price And you need to actually write the numbers down. Even if it’s on your Notes app.
When people keep it in their head, they always “forget” something.
Conveniently.
Now assume something goes wrong. Because it will.
Maybe it sells for less than expected. Maybe the buyer complains. Maybe shipping costs more. Maybe the item has a hidden defect. Maybe it takes 3 weeks longer to sell.
So do this:
• Take your real sale price and reduce it by 10 percent.
• Increase your costs by 10 percent.
Now recalc profit.
If the deal becomes weak or negative, walk away. It was never a solid deal. It was a fragile deal. And fragile deals are the ones that turn into stressful little nightmares.
This is the difference between someone who flips casually and someone who flips consistently. The consistent person is not smarter. They’re just stricter.
Liquidity is just a fancy way to say, can I turn this into cash without begging. Ask:
• Who buys this.
• Why do they buy it.
• Where do they buy it.
• How often.
If you can’t name the buyer, that’s a red flag.
Some categories are naturally liquid:
• iPhones and popular smartphones
• Popular game consoles
• Common power tools
• Certain furniture styles in good condition
• Name brand strollers and baby gear
• Tires and wheels (specific sizes move)
• Cameras and lenses (popular models)
Other categories are slow even if they’re valuable:
• Specialized industrial equipment
• Weird furniture
• Large items that require delivery
• Niche collectibles where the buyer pool is tiny
You can still profit in slow categories. But you need a bigger margin to justify the time. Also, check seasonality quickly.
• AC units sell in spring and summer.
• Heaters in fall and winter.
• Outdoor furniture in warm months.
• Gym equipment spikes in January, dips later.
If it’s off season, either lower your expected sale price, or plan to hold. Holding is fine, but only if you price it into the deal.
This one is underrated. The seller is part of the deal.
Look for signs the deal will actually close smoothly.
• Do they answer quickly.
• Are they clear.
• Do they provide extra photos without drama.
• Are they vague about issues.
• Are they pushing urgency in a manipulative way.
Also look at the reason for sale if it’s stated.
Moving sale. Downsizing. Upgrading. Clearing space. Those can be legit.
“Need gone today” can be a deal signal, but it can also be a problem signal. Sometimes they want it gone because it’s broken and they’re tired of it.
If something feels off, you don’t have to over analyze it. You just adjust the risk buffer up, or you walk.
There’s always another deal.
Here’s the final step. You decide, quickly.
I use a simple rule:
• Buy if expected net profit is strong and the margin of safety still leaves profit. • Negotiate if it’s close, but the item is liquid and low risk.
• Pass if it needs perfect conditions to work.
To make it even cleaner, set minimum thresholds.
For local flips, many people use something like:
• Minimum $50 profit per item, or it’s not worth the time.
• Minimum 25 to 30 percent ROI.
• For bulky items, minimum $100 profit because of storage and transport. For online reselling, maybe you want:
• Minimum $30 profit after fees and shipping.
• Minimum 20 percent margin.
• Under a certain weight or size unless margin is higher.
For business deals, you might use:
• Payback period under X months.
• Profit margin above Y.
• Clear growth path, not just “maybe ads will work”.
Pick numbers that match your situation. But have numbers.
Numbers keep you honest.
A quick example (so you can see it in action)
Let’s say you see a listing:
“Dyson V11 vacuum, works great, $180”
You do the test.
Minute 1: Identify. Dyson V11. Check photos, see it includes charger and two attachments. Used.
Minutes 2 to 4: Comps. eBay sold: $240 to $320 depending on condition and attachments. Average around $275.
Minute 5: Real sale price. Local sale, used, missing some attachments. Competition exists. Estimate $240.
Minute 6: Costs. If selling locally, no fees, no shipping. Maybe $10 cleaning supplies, and your time. Let’s say $15 buffer.
Profit estimate: $240 minus $15 minus $180 = $45.
Minute 7: Margin of safety. Sale price minus 10 percent: $216. Costs plus 10 percent: roughly $17.
Profit: $216 minus $17 minus $180 = $19.
That’s thin.
Minute 8: Liquidity. Dyson vacuums are liquid, yes. But thin margin means one flake, one price drop, you’re working for nothing.
Minute 9: Seller scan. If seller seems easy and it’s clean, maybe negotiate.
Minute 10: Decision. This is a negotiate or pass. Offer $140 or $150. If they accept, the deal becomes real.
That’s the whole thing. Fast, boring, effective.
Common traps that make “good deals” unprofitable
A few mistakes I see constantly.
If you anchor to the top sale, you’ll overpay.
Use the middle. Or even the lower middle. Be a little pessimistic on purpose.
If something takes 60 days to sell, that’s money tied up. It’s also mental clutter. Fast flips often beat bigger flips over the long run.
Bulky items. Fragile items. Items that attract picky buyers. Anything that needs troubleshooting. Hassle needs to be paid for in margin.
“This is such a cool camera.” “This table is gorgeous.”
Cool. Are you running a museum or a business.
Negotiation is part of the profit. You make money when you buy, not when you sell. Sometimes you buy a great deal and the sale is easy. But usually the profit is created at purchase. The fastest cheat sheet (copy this)
If you want a quick checklist you can literally paste into Notes, use this.
• What is it exactly (model, condition, included items)
• Sold comps range and average
• Real sale price (average minus 5 to 15 percent)
• All costs (fees, shipping, repairs, time)
• Margin of safety (sale price minus 10 percent, costs plus 10 percent) • Liquidity (who buys it, how fast it moves)
• Seller risk (clarity, responsiveness, weirdness)
• Decide: buy, negotiate, pass
If you do this 20 times, you’ll get fast. Like scary fast.
You’ll start seeing deals in seconds because your brain knows what to look for. But you still run the numbers, because vibes will betray you.
Wrap up
Spotting a profitable deal in 10 minutes isn’t about being a genius. It’s about being disciplined. You’re basically doing a tiny business analysis, on the fly.
Real comps. Real costs. A margin of safety. And one clean decision at the end.
If you want to try this today, pick one category you understand even a little. Phones, tools, furniture, whatever. Open your local marketplace, run the 10 minute test on 5 listings, and don’t buy anything yet.
Just practice the filter.
Because once you trust your filter, pulling the trigger becomes simple. And you stop losing deals to slow research. Or worse, winning deals that were never profitable in the first place.
FAQs (Frequently Asked Questions)
Most people miss good deals not because they lack intelligence but because they take too long to decide. They get caught up opening many tabs, over-researching, second-guessing prices, and by the time they reach out to the seller, the item is already sold. Speed in decision-making is crucial.
A ‘cheap’ deal might be low-priced but can be junk, broken, or take a long time to sell. A ‘profitable’ deal means you can realistically sell the item quickly for significantly more than you paid after accounting for all costs, hassle, and unexpected issues. Profitability focuses on real returns rather than just low price.
The three essential questions are: 1) Can I sell this quickly? 2) For how much, really? 3) What can go wrong, and does the margin cover it? Answering these helps identify profitable deals without overthinking.
The ’10-minute deal test’ involves setting a timer and following structured steps: identifying the exact item details; pulling real comparable sales (not just asking prices); estimating a realistic sale price after negotiation; subtracting all associated costs; and applying a margin of safety. This disciplined approach prevents overthinking and helps make quick, informed decisions.
Listing prices reflect what sellers hope to get but not what buyers actually pay. Only sold prices show true market value. Relying on sold comps prevents overestimating an item’s worth and helps set realistic expectations for resale price and speed of sale.
Beyond purchase price, consider platform fees (e.g., eBay fees), shipping and packaging costs, taxes, repairs or cleaning expenses, your time investment, risk buffers for unexpected problems, transportation costs if meeting locally (gas, time), chances of no-shows or relisting efforts, and
any business-specific costs like customer acquisition or software tools. Including all these ensures an accurate net profit estimate.