This may have been previously posted some time ago. I keep seeing it on Amazon and the price can't be beat:
Saiphin Moore's "Rosa's Thai Cafe: The Cookbook" Kindle Edition $.99US
I am a US Prime member and the price you see may vary.
Edited to add more sale-priced cookbooks that just came in my TASTE email. I believe they have all been previously posted...some, a while ago:
"Alton Brown: EveryDayCook: A Cookbook" Kindle Edition $2.99US
"The Hot Bread Kitchen Cookbook: Artisanal Baking from Around the World" Kindle Edition $2.99US
Slightly pricier...
Momofuku's "Milk Bar Life: Recipes & Stories" Kindle Edition $3.99US