www.bookfinder.com
A good meta-resource for finding new, used, and out-of-print books. While it does use Amazon as one resource, it also includes many, many others that are unrelated with strong business histories (Alibris, Abe's, etc). I also sell some books (1820s-1940s, generally) so if there is something you're looking for in that arena, let me know.
M.
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My thanks to all the wonderful members here; I will miss the opportunity to continue to learn and work with you.
For those who seek an alternative, it is coming.
So long, and thanks for all the fish!