What a Comp Actually Is
A comp - short for comparable sale - is the price a similar item actually sold for recently. Not what someone is asking. Not what you hope it is worth. What a real buyer paid. This distinction is the whole ballgame. Sellers list items at dream prices all the time, and those unsold listings tell you nothing. The sold listing tells you the truth.
Almost every mistake a new flipper makes traces back to skipping this step. They see an item that 'feels' valuable, pay too much, and then find out the market disagrees. Reading comps takes two minutes on your phone and removes almost all of that guesswork.
How to Pull Sold Comps in Two Minutes
The fastest, most reliable source is eBay sold listings, even for items you plan to sell locally, because eBay has the deepest record of what things actually go for.
- Search the exact item on eBay - brand, model, and condition words. Be specific: 'Milwaukee M18 FUEL impact driver' beats 'cordless drill.'
- Open the filters and turn on 'Sold Items.' The listings turn green with the sold price and the date.
- Ignore the outliers at the very top and bottom. Look at the cluster in the middle - that is the real market.
- Note the median sold price and how recent the sales are. If the last sale was six months ago, the demand is thin.
Setting Your Buy Ceiling
Once you know the real sold price, your buy ceiling is roughly 40 to 50 percent of that number. If a tool reliably sells for $130, your top buy price is around $52 to $65. That gap is not greed - it is what covers platform fees, your time, gas to go get it, and the real risk that the item sits for a few weeks before it sells.
The discipline is walking away when the price is above your ceiling. A great item at a bad buy price is a bad flip. The seller's asking price is their problem, not your obligation. There is always another item.
Buy ceiling examples (approximate - always verify current comps)
| Item | Real sold price | Buy ceiling (40-50%) |
|---|---|---|
| Milwaukee M18 FUEL impact driver | ~$130 | ~$52 to $65 |
| Peloton Bike | ~$950 | ~$380 to $475 |
| Red Wing Iron Ranger boots | ~$180 | ~$72 to $90 |
| UPPAbaby Vista stroller | ~$700 | ~$280 to $350 |
Pricing Your Own Listing
Now you flip the same data to set your sale price. You have two levers: speed and margin. Price near the low end of recent sold comps and the item moves fast. Price at the median and you make more per flip but you wait longer. There is no single right answer - it depends on whether you need the cash now or the space back, or whether you can let it sit.
A practical approach for beginners is to list slightly above where you actually want to land, so you have room to accept a reasonable offer and still hit your target. On Facebook Marketplace, buyers expect to negotiate, so build a small cushion into the number.
The Mistakes That Break the Math
- Pricing off asking prices instead of sold prices. Asking prices are wishes, not data.
- Skipping fees. eBay takes roughly 13 percent, so a $100 sale nets you around $87 before shipping. Build that into your ceiling.
- Ignoring how long an item takes to sell. A $200 profit that takes three months to realize is worse than a $60 profit you turn over four times.
- Falling in love with an item. The item does not care how much you like it. The comps do not either. Buy the math.
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Frequently asked questions
Where do I find sold prices on Facebook Marketplace itself?
Facebook Marketplace does not show a reliable sold-price history, which is why most resellers use eBay sold listings as the comp source even for local flips. eBay has the deepest public record of what items actually sold for. Use that number to set both your buy ceiling and your local list price.
Why should my buy ceiling be only 40 to 50 percent of the sold price?
That margin has to cover platform fees, your time and gas, and the risk the item sits before it sells. If you pay 70 or 80 percent of the sold price, one slow sale or one unexpected repair wipes out your profit. The 40 to 50 percent rule keeps you safe across a batch of flips, not just the lucky ones.
What if there are no sold comps for an item?
No comps usually means thin or no demand, which is a reason to be cautious, not a reason to guess high. If you cannot find recent sold listings for a similar item, either pass on it or buy it very cheaply as a low-stakes test. Never pay a premium for an item the market has not shown it wants.
Should I price my listing high and negotiate down, or price it low to sell fast?
Both work depending on your goal. Price near the low end of sold comps when you want a fast sale or need the cash. Price at the median when you can afford to wait for a better margin. Either way, leave a small cushion above your real target because Facebook Marketplace buyers expect to negotiate.
How recent do comps need to be to trust them?
The more recent the better, ideally within the last 30 to 60 days. Prices for many categories move with the season and with demand. If the only sold listings you can find are several months old, treat the number as a rough directional guide and check whether demand has cooled since.
Do fees really change the math that much?
Yes. eBay's fee is roughly 13 percent, so a $100 sale nets you around $87 before you account for shipping. On a thin-margin flip that difference decides whether you made money. Always subtract fees before you decide an item is worth buying, and factor them into your buy ceiling.
Last reviewed by Nicole on July 27, 2026
