A best bet is the Dymatize Elite Gourmet 5-lb. Whey Protein in Chocolate Peanut Butter (pictured), Cookies and Cream, or Strawberry and Cream for $45.99. Add it to your cart via Set & Save and activate the above coupon code to drop it to $36.42. With $4.99 for shipping, that's the lowest total price we could find by $4. (For further comparison, we saw a 2-pack of this item for a per-unit price of $35.95 last fall.)
Be sure to cancel Set & Save once your order ships to avoid being billed for subsequent shipments.