All of Amazon’s most popular Kindles are on sale right now

Amazon breathed new life into the book industry by, well, killing books. Sure, some people still enjoy printed books, but the preference is now digital and it's all thanks to the Amazon Kindle line of eBook readers. Kindles make it easy to carry hundreds or even thousands of books with you anywhere you go, and they include great features such as wonderfully visible E Ink displays and fantastic battery life.
Is your old Kindle long overdue for an upgrade? Do you have an eReader from another compa