In our opinion, the Kindle is one of the best eBook readers on the market.
It is simple, lightweight, extremely low powered (so a single battery charge can last for weeks), and integrates great with Amazon.
Our favorite part is the true LCD screen, which does not have any backlighting.
Staring at anything with a backlight, like a computer screen, phone or tablet screen, or television is the same thing as staring at a light bulb.
These can cause eyestrain, a medical condition that can give headaches and effect eyesight, especially with prolonged use in low-light rooms.
The Kindle does not use a backlight.
The free eBooks are yours for life, once you "purchase" them.
They are advertising their Kindle Unlimited subscription with each of these books, but you can just purchase each eBook (or eBook series) outright.
You do not need to subscribe to Kindle Unlimited to get these deals.