Use a free textbook comparison tool like the one found at campusbooks.com to see an overview of purchasing options at several online booksellers. Type each book's 10 to 13 digit ISBN code, or title and author, into the search box to get a breakdown of the best prices currently offered by major online venders.
Search online for every title that you cannot find using the comparison tool, or to see a wider variety of price options. Type each book's ISBN code, one at a time, into the search engine's search box. If the ISBN does not bring up the book you need, type in the full title and author information. Open the websites for stores or individuals in separate Web browser windows for easy comparison.
Browse online auction websites (see links in Resources), which tend to have a smaller selection of books but often offer textbooks at excellent prices.
Examine all pertinent information each seller offers, including shipping costs, shipping time frame, book quality, return policy and total cost. Remember that saving a few dollars may not be worth it if the seller cannot guarantee you will have the book in time for your class or if shipping costs are exorbitant. A book listed in "poor" or "fair" condition may be missing pages you will need for class. Check the return policy, in case your book arrives in worse condition than advertised or in the wrong edition. If the site doesn't offer a full refund (usually minus shipping costs) you risk having to buy a book twice, negating the benefit of shopping online.
Consider reselling your textbooks online after you complete the course. The best time to resell textbooks is between college semesters, about two weeks before a new semester begins. Take care of your textbooks and keep track of what you paid for each to increase the chances of getting your money back.