Textbooks
Book Swap
Booklist
Some web sites that offer textbook purchasing
www.half.com www.CampusBooks.com www.CheapestTextbooks.com www.Textbooks.com http://www.mbsdirect.net/Index.htm www.alibris.com
These sites searches for the textbooks and the best prices:
www.Bookfinder.com
www.Textbookhound.com
http://www.directtextbook.com/