>there's an excellent used and
> rare book search site called bookfinder.com
 
I also suggest searching directly on Advanced Book Exchange, which has
6000 bookdealers (& is so far the largest).  Often Bookfinder has
software trouble picking up Advanced Book Exchange, and if you don't
search separately on ABE you'd miss the books listed there.  Their web
address is:  (  http://www.abebooks.com  )
 
Another site is Bibliofind:  (  http://www.bibliofind.com  )
 
Regards,
Rosalie Gancie