Below are some good websites that you can search books and find good deal.
Online shopping from the earth's biggest selection of books, magazines, music, DVDs
Alibris connects to hundreds of independent booksellers around the world, finding you some of the best prices on used and new textbooks. Want to save on shipping? Run an Alibris search to see if there’s a local bookstore that will allow you to pick up the book you’re looking for.
Used, new, rare and out of print books. Find classic collectibles, rare signed editions, used textbooks, and inexpensive bestsellers.
Buy and sell previously owned CDs, DVDs, books, and video games.
Other sites for book comparison:
Compare new and used books prices among 127 book stores in a click. Find the lowest price.
book search and price comparison, some books are international version, but, should be ok to use.
buy textbooks, sell textbooks, used college textbooks, new college textbooks, textbook price comparison
Books-A-Million is the third largest book retailer in the USA. They offer bargain Books, Discount Audio Books, Clearance Bestsellers.