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FYI, Amazon's new promo: Save up to 80% with Kindle Textbook Rental

Now students can save up to 80% on textbooks with Kindle Textbook Rental.

Great savings: Save up to 80% off the list price of the print textbook
Pay only for the time you need: Choose a rental length between 30 and 360 days and pay only for the exact time you need a book. Extend your rental for as little as one day or convert to purchase
Rent once, read everywhere: Rent and read tens of thousands of textbooks on PC, Mac, Kindle, or your mobile device
Keep your annotations: Access your notes and highlights anytime, even after the rental expires, at kindle.amazon.com