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Man, I wish I knew of some. I like sportlots, but 99% of the cards listed there are $0.18 commons. I bought a lot of cards from them in years past, but as I get on in the supercollecting hobby it's one in a million to find a card I need there now.
I do check Ebid now and then. I found a pretty rare card there a few years ago that I've never seen before or since...