Compare used textbooks

Buy several textbooks together – Buying several books together may reduce the total price of shipping the books, as usually the shipping rate for the second book is lower than the cost for the first book. Few Book Price comparison sites (like BooksPrice) will allow you to Compare used textbooks the price a complete "book cart" and will let you know the cheapest total price for all the books.
Swap Books – Several new sites offer the ability to swap books that you do not need any more, and to get in return books that you actually need. Swapping books is not just a way to get the books that you want in a low cost, but also to make way for these books on your shelves. Examples of such sites are: bookins.com, swapyourtextbooks.com.