Quote Originally Posted by kaur View Post
I have used www.abebooks.com to find out of print books. This e-shop has connected network of bookstores and browser helps you to find best price.
alibris.com isn't bad either. I ususally go to them for hard-to-find books. Also, most of these bookstores can get you in-print and just-released books for significantly less than you'd pay in a big-box B&N type store.

It pays to shop around though. Prices fluctuate quite a bit. Van Crevald's "Fighting Power" book went from $60 to about $120 in the span of a week.