GNC offers the Dymatize Nutrition ISO-100 Whey Isolate Protein 5-lb. Jar in Vanilla Cream or Milk Chocolate for $79.99. Coupon code "APRSHWR" drops it to $55.99. With $3.99 for shipping, that's the lowest total price we could find by $13. Each serving contains 25 grams of protein, and each jar contains 77 servings.