Amazon has the 16oz Duncan Hines Dolly Parton's Favorite Creamy Cake Frosting (Chocolate Buttercream or Cream Cheese) on sale for $1.50 - 5% off with Subscribe & Save (can cancel anytime) = $1.43 with free shipping on $35+ or with Prime. Walmart has it in Vanilla Buttercream for $2.12.

Walmart also has their store brand 16oz Great Value Frosting Tub (Vanilla, Chocolate, or Cream Cheese) for $1.66