I've started selling some old textbooks online (specifically half.com) and was wondering what is the best and cheapest way to ship textbooks? My problem is that some of the hardcover books are nearly 5 pounds and cost a fortune to ship. I plan to ship all of the books using media mail from USPS. Is this the preferred method? I don't want the books to take 2 weeks to reach the destination but I don't want to pay an arm and a leg for shipping.