There are a number of different websites dedicated exclusively to the used textbook market such as Chegg.com and Cash4books.net. Additionally, sites like Amazon and even Barnes&Nobel feature ways for users to sell used textbooks online.
In order to sell used textbooks online, it is important to maintain the condition of the books. Most online used textbook sales sites will not accept books that have too many marks or extensive wear and tear. As a result, it is useful to plan ahead when looking to sell used textbooks. Many sites provide pre-made mailing labels, and sites such as Cash4Books.net even pay for the shipping costs. This makes the book shipping process much simpler.
It is advisable to search through a few different online used textbook sale sites. Different sites will provide users different quotes for the value of the books. Be aware that used textbooks virtually never bring back the full value of the original book purchase. Look around to find which site offers the best price. The easiest way to navigate these online used textbook sales sites is through the International Standard Book Number or ISBN located on the textbooks. This number allows quick and easy book and edition identification.