I am sure alot of you already know about this but I thought I'd pass it along just in case. There is a yahoo group (email list) called Book Base, it is where you can list books that you want to sell.  Alot of my homeschooling friends use it to find books for thier kids and they also resell books that they don't need anymore on there to raise fund for next year's books.

check it out.

 http://groups.yahoo.com/group/Bookbase/

God Bless!!

Sandy