Where do you buy your books?

About seven years ago I began a collection of a series of books after watching Oprah one afternoon. She was talking about the book titled "Men Are From Mars / Women Are From Venus" authored by John Gray. Being on a limited budget I decided to check out Amazon books online. The prices were great as long as you weren't buying new books. However, I saved lots of money by purchasing nearly new books, or slightly used books. Most of the time the shipping was more expensive than the books themselves. As for this single mom, shopping around, finding good deals, and saving up to 80% off the purchase price of books, definitely works for me!