Once you pop, the bun don't stop ... Pringles is launching limited-edition potato-based Pop Dog Buns inspired by three of its most popular flavors: Sour Cream & Onion, BBQ, and Honey Mustard. The flavored buns will be available today through Pringles’ "Once You Pop" marketplace. Customers can get the buns free with the purchase of a Pringles three-pack priced at just under $7