If you want to save money on book purchases, start at this website. I have saved hundreds of dollars on textbooks from using sites like this. Dealoz is easy to navigate and will lead you to savings on your books. You will do best by knowing your ISBN # however, the title and or author will help you get started. If it is a textbook you are shopping for I would strongly reccommend using ISBN's. For example a used Math book in campus bookstore listed for 110.35. Including shipping I paid 58.99 for this book. Just make sure you are aware that some sellers have Internation Editions, this is usually noted and you can ask the seller questions if listing is unclear. Also make sure you note if the book is an Instructor's Edition.