Just finished cleaning a batch of 5200 cartridges from eBay. They're mostly commons, but they're all great games, and they all work! (Not that I was worried; Atari's 5200 carts are practically indestructible.)
Nope, I didn't get that one. My lot was 17 carts for about $28 shipped. Very happy with that price, since it included some favorites that I've wanted for a while, like Q*Bert and Star Trek: SOS.