I ordered a book from this store. The price seems lower than other vendors. The reason is because after you give them your credit card number to pay for your purchase, they charge a second charge for a "membership"! I did not intend to become a member of anything. I was not asked if I wished to join anything. No membership fee was disclosed to me. Beware of HotBookSale.com because it is a scam to charge much more than other vendors for books. read full review »