Alibris: Rare Books

I just found Alibris while looking for the missing two books in Isaac Asimov's Robot City series. I was able to get first editions of both volumes and now my set will be complete.

It looks like a great place to buy or sell hard to find books. I just may have to set up an account, or at least look up my first edition of Star Wars, Empire Strikes Back, and Return of The Jedi. I know I've been keeping those books around for some reason. I just don't know if the market is there yet with all that stylized flop prequel trilogy.