Unless it's something I REALLY want, I go to the used bookstore at my libraray and get hard covers for $2 and paperbacks for 50 cents, or I pick up annual books at used book sales at libraries or from the flea market.
Hey.....I'm cheap, what can I say?

If it's something I REALLY want, I may buy from a regular bookstore, but that is so rare now as to be nonexistent.