If you are on the Paleo Diet or are Gluten Free, here is a great slowecooker eCookbook (that has a 5 star rating) – Paleo Slow Cooker: Simple and Healthy Gluten-Free Recipes
(Or if you are a Prime Member, you can borrow it for FREE.)
Pricing was current when the post was published, however Amazon prices change often, so please check before you buy.