Amibay is probably your best bet (or forum offers); eBay isn't bad for buy-it-nows these days but I avoid avoid AVOID the auctions. Wasn't someone selling a SW copy of Falcon for the CDTV for like $2000 recently?
I've seen equally crazy stuff in the D&D book resale market, too - RARE UNOPENED D&D MODULE KEEP ON THE BORDERLANDS BUY IT NOW FOR $600.00 and such (for the uninitiated, that adventure book was printed in the millions of copies and sold as a starter module inside boxed rule sets, there is nothing rare about it - even my autographed copy is probably not worth the paper it's printed on...)
