Where do you buy your books?

I typically just go to Barnes and Noble, although I will probably scrounge some used books throughout the summer from a few local places.

There are six public libraries within walking distance of my apartment. And if they don't have the book I want, I just go to one of the smaller ones and put in a request. Then they either get it from another library or buy it, then I have the book I want in a few weeks for free.