Today Only there is a Deal for the Kindle book of Eric Metaxas Book Martin Luther: The Man Who Rediscovered God and Changed the World Kindle Edition $1.99 (also available at B&N). Both Kindle and Nook Versions.
https://www.amazon.com/Martin-Lut…tin+luthe
Also, Available through B&N at the same price:
https://www.barnesandno