There are seven first-time free paleo books today. Six are the
Caveman Family Favorites series. The seventh is Paleo Lifestyle
Magazine Interviews - Issue #3. There are also two that were free in
the past (one is just low carb). You can see all of them here:
http://www.amazon.com/s/rh=n:283155,k:paleo,p_n_feature_browse-bin:618073011&sort=price
Be careful going down the list. Stop at the point when they are no
longer free. Amazon will list ones that are "read free" for Prime
users, so you have to check the second price, which has "to buy" after it.