Kindle 6" eReader in Black or White for $50.
Available at Amazon for delivery, and Target or Best Buy with in-store pickup.
The Kindle serves one function- reading eBooks on a lightweight, thin screen with super long battery life (1+ week per charge).
Unlike a phone or tablet, the Kindle does not emit light.
This means staring at the screen will cause less eyestrain than a phone or tablet, especially in dark rooms.
Also, the Kindle's plastic screen does not reflect light, making the Kindle easier to see outside in the sunshine.