3 of Steven Raichlen's grilling books are on sale for $1.99, listed in the Kindle Deal of the Day, but available at that price at B&N and Kobo also (Kobo couponable if you've got working coupons). There is another $1.99 book and several under $3 books that may or may not be regular price, I'm not sure.
Barbecue! Bible Sauces, Rubs, and Marinades, Bastes, Butters, and Glazes: Sauces, Rubs and Marinades
Man Made Meals: The Essential Cookbook for Guys
BBQ USA: 425 Fiery Recipes from All Across America
Amazon B&N Kobo