Comps
Comps are recent sales of the same card in the same condition or grade. Buyers and sellers use them to judge what a price should be.
In more detail
To build comps, find completed sales of the card you are pricing, matching the printing, the condition or grade and the sale type. A raw Near Mint copy and a graded copy of one card are different items, so each needs its own comps.
Use several sales, not one. TCGplayer's market price averages across multiple recent transactions for this reason, since a single sale can be unusually high or low.
Check dates. Sales from last year may not describe today's price, especially after a reprint or a surge in demand. A comp is useful when it is recent, close in condition and large enough in number that one odd sale does not decide the figure.
Related terms
Where Rip.fan covers it
Updated