50%-off my COFFEE book! September 29, 2014 Here’s a silly enough reason to have a sale! Today, 50%-off my Eisner-nominated “Best Humor” book COFFEE, because of Nat’l Coffee Day! This very much feels like a Hallmark-created holiday of some sort, but who am I to judge! ( http://sheldonstore.com/collections/all-coffee ) Both Sheldon coffee posters are on sale, too!