[koala_advert]

This doesn't seem very profitable when so many textbooks come out with a new edition every year.

[DenisM]

Look at the prices - e.g. $170 new, $100 to rent.

http://www.amazon.com/Discrete-Mathematics-Applications-Kenn...

[murtza]

Chegg, an online textbook rental company, up to now has been doing pretty well.

http://techcrunch.com/2010/06/05/teardown-chegg/

Chegg's revenue is going to take a hit if Amazon is competing in the same space.