Sarah C.
Google
A wonderful place for used books, with great prices. (These are mostly books for reading, not collector-quality first editions.)
I visit the area often to see relatives, and I always stop by for my reading fix. Plus they take donations, so you can get rid of those old reads that no longer interest you.
Especially good for inexpensive paperbacks.
You'll go home with a lot more books than you intended, at a much lower cost than you expected! A huge selection of both fiction and nonfiction.