Use the promo code SHIPFREE to get $25 worth of shipping costs for free! You do need to buy a $10 minimum worth of items but this is an awesome deal! I've found loads of books for only $.75! If you purchase items from the same vendor the additional cost of shipping goes down.
For my order the first item was $3.49 to ship and each additional item cost $1.89 from the same vendor.
Shop through ebates and get 4% on your purchase!
