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...the library

The library also has TV shows and movies on DVD.

touche, good point.

And before you complain that your library doesn't have many good CS books, look into inter-library loan. Libraries can often ship from other branch and regional libraries, and sometimes from both public and academic libraries throughout the US* (generally for a small fee, and be patient). I've borrowed rare books (including the Codex Seraphinianus!) for several weeks through my library, for $5.

Of course, if you have access to an academic library, particularly at a university with a decent CS program, start there. Particularly if you're looking for research papers, rather than books - it's what they do.

(I worked in a library for several years. <3.)

* I'm assuming you're in the US - I don't know about public libraries elsewhere.

There are a few sites that already do that, but I've personally never used them.

http://www.bookswim.com/

http://www.booksfree.com/

I use paperbackswap.com which works pretty well. I've mailed maybe 2 dozen books on the service and received maybe 10. It works quite well (though the design sensibilities are a bit off putting).