I have spent the evening searching for other sites to buy books at a discount.
A few disappointments.
Mybookmonkey.com: Requires ISBN for a search. It cannot search by title or author.
Chegg.com: Virtually everything is only for rent.
Bookbyte.com: Out of stock on so many. Mainly Textbooks.
BooksRun.com: Nearly all books link to amazon.com to purchase.
A few that I will be looking into further.
bookstores.com
They sell books, movies, and games.
valorebooks.com
Lots of book titles of all genres. Even blogs on college life.
textbookrush.com
Books and movies. Not just textbooks but lots more, like
"DC Comics: Wonder Woman Coloring Book."