Maybe you got a new Kindle for Christmas, or maybe you use a Kindle reader app on your tablet or smartphone. In any event, you’re probably always in the market for some deeply discounted books for it. Today, Amazon is offering up to 80% off on more than 500 educational eBooks for your Kindle . They are discounting books in many categories: travel, self-help, politics, professional, technical – you name it. I saw prices as low as $1.49 on these books. The sale ends today, so you should head on over to Amazon now.