Every Card I have is for sale at the right price. If I have a lot of something I would sell at half book value if you pay for the shipping (it seems to be getting expensive at times). I collect Football card especially The Broncos and QB's but have tons of cards from when I was a kid some not in good shape. Played and read them to much did not know that they could be worth Money. All basketball baseball and other sports are for sale, just make an offer. They are not posted for sale yet on here just not organized to find them easily.
I probably have over 100,000 cards and it takes a long time to impute them all so maybe someday I will get to the cards not football I want to sell. Right now, I am using Tcdbase as an inventory of what I have.