I know that people have of course mentioned Goodwill stores and shopgoodwill.com but a lot of people don't know they live near a Goodwill Warehouse or can find books through http://www.goodwillbooks.com
Goodwillbooks has a ton of books that a reading nerd like me swoons over. Not to mention their quilting section of books is HUGE
But my personal favorite place is the Goodwill Warehouse. It's the place where almost all of the bits and pieces that didn't sell at the other goodwill's along with some newer stuff is sold. Usually its as warehouse type building with a bunch of open bins that you can sort through. On my recent trip with my roommate I got an amazing condition sewing chair, a commodore 64 screen, a jewelry shelf, a stash of vintage patterns, several amazing books, a lamp, artwork, an R2D2 statue and some small knickknacks for about $45.
They go by weight in pounds and they usually take furniture and TVs by item (my sewing chair cost me about $3). If you have a guy that hates going to thrift stores he might actually like this place (my roomie is proof) and if all else fails they normally have a Goodwill Bytes computer store near by, send him over there.
I love goodwill and I have even gotten my family to start loving it too!