Some advice is to add a feature that would allow the seller to enter how much they paid for it. I know that COMC has a feature that says how much you paid for it on their site but a lot of cards that I have I did not buy.
Please Note: I do a majority of my transactions through COMC. If you like a card and don't have an account feel free to PM me and we can work something out!
Looking to trade/buy 2011 Topps Marquee Museum Collection Gold Frame Autos /10