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It should be noted that there seems to be a market for "international editions" of textbooks used in the United States. The international editions are usually paperback, printed on thin paper, and display a different cover, but are otherwise purported to have the same content as versions printed for sale in the United States. Because these books are not intended to be sold in the States, however, it may not be legal for the book to be imported. Additionally, students often have a difficult time reselling the international editions because of the inferior quality.
Given the alternatives noted above, there is a good possibility you can save on the average $900 that students spend each year on college textbooks. Learn something new everyday, at a fraction of the cost!