I almost hate to post this, I don't know how well known it is, and I like to get first grabs... :-) www.powellsbooks.com, an incredibly great bookstore for any number of reasons, has had an Early Computing section (online) for years. I get a lot of stuff from them. Prices aren't bad. CP/M, Amiga, old old, etc. Selfishness aside, I think the Early sections would benefit from more traffic. Browse (left column): Computers -> Computers: Early. At the top "list all titles" etc. They buy too.