Library book suppliers
The two largest book distributors in the U.S., who have school library supply programs are:
http://www.btol.com/s_library.cfm
http://www.ingramlibrary.com/progserv/K12/default.asp
Betterworld is a supplier of used books at competitive rates
http://www.betterworld.com/List.aspx?Category_ID=17&
