I just found out about a textbook rental service called Chegg (for "chicken and egg"). There's a good article about it in Business Week Online at http://search.ebscohost.com/login.aspx?direct=true&db=f5h&AN=23783243&site=ehost-live
Prices seem to be about 50% of retail for textbooks. Check it out at www.chegg.com!
North County Librarian