There is one first-time free paleo book:
Note that the author's pen name is Mega Recipes. There are only about
three, very informal, recipes in the book. But if you look at the
cover image...
Paleo Diet - A Beginners Guide to Learn How to Eat and Exercise Like
a Caveman by Mega Recipes
http://www.amazon.com/dp/B00AB2Z94Y
This was also free in the past:
The Paleo Lunch For The Working Woman Easy And Delicious Paleo
Recipes Volume 1 by Jessica Andrew
http://www.amazon.com/dp/B00A46DS0Y