ST. LOUIS – Get out your phone and download the Smoothie King app because that’s the way to save some money today and beyond! In celebration of National Smoothie Day, Smoothie King app members can get a free 20 oz. smoothie when they buy a 20 oz. or larger smoothie in the same order when they use the app. Then beat the summer heat with a $4 treat. Enjoy a 20 oz. Angel Food Smoothie or a 20 oz. Angel Food Slim Smoothie for $4 after 4 p.m. every day until June 28. Make sure you use the app!