New Leaf Publishing Group has a new set of books since the last time I checked (which was a while ago) in exchange for their
newsletter signup.
Buried Alive: The Startling, Untold Story About Neanderthal Man by Jack Cuozzo
Six Days: The Age of the Earth and the Decline of the Church by Ken Ham
Both books are creationist apologetics.
After signing up, you get a page with downloads of both books in mobi, epub and PDF. The site won't let you sign up multiple times with the same email, so you need to use a different email if you've signed up before. Gmail addresses with periods in them work as alternate emails (janedoe@gmail.com and
jane.doe@gmail.com are the same as far as Gmail's concerned, but different addresses for the signup).