Your professor will often choose a particular edition or year of a textbook to teach for class. To make sure the book you are buying is the same one your professor requires, compare the ISBN (a number on the back or first page of every textbook) of your book with the ISBN on Offtextbooks.com. If the ISBNs match, you can be assured you have ordered the correct book.

Be on the look out for old editions! Old editions of a textbook are offered on Offtextbooks.com at a substantial discount. Just make sure your professor doesn't have a problem with purchasing a different edition than the one required from the course--an older edition may have different exercises or may be missing chapters. If you are in doubt, purchase the correct edition and you'll still save a lot of money!

If you need your book in a hurry, be sure to choose "Expedited Mail" as the method of shipment. The default method, Media Mail, should arrive in 4-12 days from the time of shipping. However, in some rare instances Media Mail shipments can take as long as 30 days to arrive.