Since its debut in 2007, the Amazon Kindle has changed reading habits for millions of people. Here are some ways you can load up your Amazon Kindle with free e-books. Screenshot: AmazonOne way to grab free e-books is to keep your eyes open for special events and offers on titles. Use e-book search sitesThis is somewhat related to the first tip above, but there are independent e-book search services that will uncover free Kindle e-books for you as and when they appear, saving you a substantial amount of time searching for them. Another option is BookBub, which is on a mission to bring you the biggest discounts currently on offer on the Kindle Store (and other e-book stores)—and that includes free e-books.