If you enjoy reading as much as I, you will want to investigate BookBub.com. It is a daily e-mail service that features limited-time discounts on e-books. Many of them offer for free download for a very limited time.
I am just one of the more than 1 million people owning an ipad, iphone, kindle or other ereader that has signed up for the BookBub service. And, the service does a great job on matching the offers to your personal interests. Go to BookBub.com to learn more.