Amazon kicks off March with a cheap Kindle sale.

For a limited time, you can get the waterproof Amazon Kindle Paperwhite e-reader for $84.99. That's $45 off and the lowest price ever for this e-reader. Even better, Amazon is bundling three months of Kindle Unlimited for free with this Kindle deal (a $30 value). This subscription service gives you access to over 1 million ebooks, magazines, and audiobooks on a variety of devices. This is one of the best Amazon deals we've seen.

The Kindle Paperwhite is one of the best Kindles you can buy, with a 6-inch anti-glare 300ppi display, 5 LED front lights, and 8GB of storage for thousands of books. IPX8 waterproof rated Kindle Paperwhite can be read safely by the pool, at the beach, or in the bathtub.

Reviewers of the Kindle Paperwhite liked its bezel-alike flash screen, waterproof design, and Bluetooth capabilities for audiobooks, giving it 4.5 out of 5 stars and an Editor's Choice award for its overall performance.

Our lab tested the Kindle Paperwhite's water resistance by submerging it in a pail of water; after 20 minutes in the water, the e-reader continued to work and responded well to page turns. It was as if it had been dry the whole time.

Want a cheap, reliable Kindle? Amazon sells the new Kindle for $59.99; it has a 6-inch glare-free display, 4LED front light, and 4GB of storage. It also comes with three months of free Kindle Unlimited.