C. S. Lewis's classic Space Trilogy available for a limited time, you can get all three e-books for just $1.99 each and The Screwtape Letters for $3.99!
http://harperonebooks.com/2012/12/12/from-now-until-1113-you-can-get-the-enhanced-e-book-edition-of-c-s-lewiss-the-screwtape-letters-for-3-99/#
