I don't have access to much in terms of finding poltical books in my area, as I live in a crap place for that kind of thing*. But with the PC I can search on ABE and other sites for the stuff I need, providing it is for a reasonable price. I aint no snob, so special hardbound first editions are not my cup of tea. As long as it is in good nick and I can read it without the pages falling out I am fine. And of course, that it will last a few more readings than just the once.
*Although there is some bloke who has his own archive in my town, an ex CPGB member and he has thousands of old books, pamplets and other things, and is selling a small portion of it, but I don't se him that often, he is too busy.