Here's just one of them Northwest Missouri State (scroll to the bottom) - http://www.nwmissouri.edu/admissions/laptop/index.htm

Note that their stats about how rentals save students $1160 a year are sort of BS. On books where renting saves you a lot of money over the full retail price (which no one ever pays anyway), you can usually just buy the book outright for the same amount on Amazon (and then sell it back when youre done for a ridiculously lower total cost of ownership).