1. Chegg: Chegg offers book rental websites with flexible rental periods, free shipping on orders over a certain amount, and the option to extend rentals or buy the books if needed.

   Amazon: Amazon's textbook rental service allows you to rent textbooks for a semester at a time, with the option to extend rentals or purchase the books at the end of the rental period.

   CampusBookRentals: This platform offers textbook rentals with free shipping both ways, flexible rental periods, and the option to highlight in the books.

   VitalSource: VitalSource specializes in e-textbooks, allowing you to rent digital textbooks for a specified period. This can be a great option if you prefer digital reading and want to save on physical book costs.

   BookRenter: BookRenter offers textbook rentals with savings of up to 80% off the retail price, free shipping on orders over a certain amount, and flexible rental periods.

   eCampus: eCampus provides textbook rentals with savings of up to 90% off the retail price. They offer free shipping on orders over a certain amount and flexible rental periods to accommodate your needs.

   TextbookRush: TextbookRush offers affordable textbook rentals with savings of up to 90% off the retail price. They have a large inventory of titles available for rent, with options for standard and expedited shipping.

   Bookbyte: Bookbyte offers cheap textbook rentals with savings of up to 90% off the retail price. They provide free shipping on orders over a certain amount and flexible rental periods to suit your needs.

   BookRenter: BookRenter provides textbook rentals with savings of up to 90% off the retail price. They offer free shipping on orders over a certain amount and flexible rental periods to suit your needs.

2. 1. CampusBookRentals: CampusBookRentals offers textbook rentals with savings of up to 90%, along with free shipping both ways and the option to highlight in the books.

   2. VitalSource: VitalSource specializes in e-textbooks, allowing you to rent digital textbooks for a specified period. This can be a great option if you prefer digital reading and want to save on physical book costs.

   3. TextbookRush: TextbookRush provides affordable textbook rentals with savings of up to 90% off the retail price. They offer free shipping on orders over a certain amount and flexible rental periods.

   4. eCampus: eCampus offers textbook rentals with savings of up to 90% off the retail price. They provide free shipping on orders over a certain amount and flexible rental periods to accommodate your needs.

   Before renting, make sure to compare prices, rental durations, return policies, and any additional fees such as late fees. Also, consider the condition of the book and any requirements from your professors regarding editions or supplemental materials.

Before renting, make sure to compare prices, rental durations, return policies, and any additional fees to find the best option for your needs.