If it's for PSA cards, they added free historical prices on their site in December. Only goes back 1.5 years from eBay, but about 15 years of auctionhouse data. If you see an error (wrong price, wrong card/cert #, multiple cards in one auction lot), you can report and PSA will fix the entry.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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