http://livingpictures.org/beststuff/2010/03/books-amazing-devices-last-a-long-time/
Buy books
How can you go wrong ? Just get good ones. A good book could help you make money, save money, start a career, inspire you, and countless other things. You can get used ones, too, that have the same value at a lower cost.
Try TextbooksRus.com ( NOT just textbooks ) They have all kinds of books. They also buy your used books. TextbooksRus is located in Ohio, but has a huge inventory and will ship books anywhere. They also have a United Kingdom operation, selling to Europe, and also buying books from customers.
TextbooksRus also sells vast numbers of college textbooks, too.