TL;DR
A comp is what an item actually sold for recently, not what someone is asking. Check sold prices before every buy so you know your real margin and how fast the item moves. This one habit separates profit from a garage full of dead stock.
Checking comps is the most important habit in reselling. A comp is what a similar item actually sold for recently - not the hopeful asking price on an unsold listing. Sourcing without checking comps is guessing, and guessing is how resellers end up with a garage full of items that will not sell. A thirty-second check before you buy protects every flip.
Look at sold, not asking
The number that matters is the sold price, because anyone can ask any price for an item that never sells. Filter for completed or sold listings on the platforms buyers use, and read the real transaction prices. An item listed high but never sold tells you nothing about its value.
- Filter for sold or completed listings, not active asking prices.
- Match condition, brand, model, and size as closely as you can.
- Look at several recent sales, not one lucky outlier.
- Note how fast items sold, not just the price they fetched.
Check speed, not just price
A high resale price means little if the item takes six months to sell. Alongside the price, note how quickly comparable items moved. A modest profit that sells in a week often beats a bigger one that ties up your cash and space for months. Both numbers matter to a real flip.
Match the item honestly
Comps only help if you compare like with like. A pristine name-brand piece is not the same comp as a scratched generic one. Match brand, model, condition, and size as closely as you can, and adjust your expectation down for any flaws the item you are buying has.
Make it a reflex at the source
The habit only works if you do it before you buy, on your phone, in the store or at the sale. Build it into your routine so it becomes automatic. Resellers who check comps every time buy with confidence; those who skip it learn the hard way when items sit unsold.
Common questions
What exactly is a sold comp?
It is the price a similar item actually sold for recently, not an asking price on an unsold listing. Sold comps show real value, while asking prices show hope. Always base your buying on sold, completed transactions.
Where do I check sold comps?
Use the sold or completed-listing filters on the platforms buyers use for that item, and Marketplace itself for local demand. Look at several recent sales, not one. The goal is a realistic range, not a single number.
Why do asking prices mislead me?
Anyone can list an item at any price, even if it never sells. High asking prices on stale listings create false confidence. Only completed sales tell you what buyers actually pay.
Should I care how fast something sold?
Yes. A big profit that takes months to sell ties up cash and space. Note both the price and the speed, and often favor items that move quickly at a modest margin. Turnover matters as much as margin.
How many comps should I check?
Look at several recent sales to avoid being fooled by one lucky outlier. A small range gives you a realistic expectation. One data point is a guess; a handful is a decision.
What if I cannot find comps for an item?
No comps often means thin demand, which is itself a warning. Either the item is rare or few people buy it used. When in doubt, pass rather than gamble on an unknown.
Keep going
Check sold comps before every buy and stop guessing.
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