 Enjoy. Yum, yum for the tum-tum. How about the large 20-ounce milkshakes? Over 60 flavors to choose from. $6.89, we give you two of these for $8.25. The large 20-ounce concretes, these are your favorite toppings blended through a fresh cup of vanilla ice cream becomes a spoonable dessert in a cup.