http://www.bookcloseouts.com/default.asp?N=0

Dollar 4 Dollar Promotion Details

This is how it works:

First you must place $25.00 or more worth of books into your shopping cart. This amount is before taxes and and no coupons may be used in conjunction with this offer. These books must be chosen from books that are not on the free book list.
Once you have met the above requirements you may select your free books from the books on the list.
It's a "dollar 4 dollar" sale so you may match every dollar in your cart with a dollar's worth of free books! For example: If you have $25.00 in your cart that you are paying for you may select $25.00 worth of books free. If you have $50.00 dollars worth of books in your cart that you're paying for, you may select $50.00 dollars worth of free books to go with those books.
You must order your free books at the same time as your paid for books. Simply add the books you are paying for to the cart and then add the books you want for free to the same cart. We are NOT issuing a credit or coupon to be used at a later date. You must select your free books from the list before you check out.
Books that you are receiving for free will have the word "FREE" in red letters in the total column of the shopping cart.
Books in your shopping cart that you have selected from the free books list will have a blue title.