Having covered Amazon Prime Day for as long as we have, we know what to expect. One thing that's almost always certain — Amazon is going to drop prices on their Kindle e-readers. The longest Prime Day ever is now underway (through July 11), and we're seeing lots of discounts roll in on the popular reading devices.

Whether you've been waiting for the right time to upgrade your e-reader or have been tempted to finally take the plunge on a Kindle, there's never been a better time to make your move: Amazon Prime Day is historically the best time of the year to save on Kindles — and the sale ends tonight.