Book is the marketplace to buy books on your iPhone. Book features hundreds of thousands of books available from dozens of different retailers. This means you will get the best price available. Book lets you order the book you are looking for right from your iPhone. You can pay for books using Visa, MasterCard, American Express as well as Google Checkout. You can order books from different vendors in a single purchase. During the checkout Book displays which vendor will ship the book to you and how long the shipping time usually takes. Check back with Book on a regular basis as we are adding vendors all the time and the inventory changes from hour to hour.