Online Textbook Sources

Tired of ridiculous pricing, arcane policies, hideous lines and surly employees? Start looking online for your textbooks.

BIG WORDS: Online Textbook Store
I haven't tried them out yet, but the prices look good and the site is well designed and fast.
Powell's Books
The best online resource for used books. Their prices are great, the site's fast, and they have some remarkably rare titles. I ordered some textbooks from here and the pricing was great. I did make a mistake once when I ordered the first edition of a book and the class was using the second edition. Doh!