Amazon offers the Muscle Milk 11-oz. Genuine Protein Shake 12-Pack in Chocolate or Vanilla Creme for $13.28 with free shipping for Prime members. That's tied with our mention from last week and the lowest price we could find by $2. Each non-dairy, gluten-free serving features 25 grams of protein, 4 grams of fiber, and 0 grams of sugar.