You may want to check
www.paperbackswap.com - I got Osborne's "Hypergrowth=
" book autographed by him to an employee even! Perfect condition ! Very=
reasonable price & shipping.
Also, Amazon and Barns & Noble have services for out of print books by ver=
y inexpensive reliable resellers.
It's also worth checking ABE books (
http://www.abebooks.com/ I think). I
found a couple of old books there that I wanted, and the prices were
reasonable. They haev a keyword/title search, so you don't have to know
the iSBN.
-tony