KnetBooks is an on-line website that allows students to save 65-85% on textbook rentals in the United States. You are able to search your book by the ISBN search bar, or use the category section to browse through the listed available textbooks. Selling textbooks is a feature the website also has, where a student who has previously bought a textbook, can sell it to Knet Book to receive payment via check or electronic payment processor. There is free shipping available on renting a textbook and sending it back. The textbooks can be rented for different durations of time and if you find you need the book for longer than anticipated, you can also add on time to your rental for a small fee.