Amazon offers the Muscle Milk Genuine Protein Powder 2.47-lb. Jug for $13.06 with free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $7.11.) That's the lowest total price we could find by $9. It features a Protein Digestibility Amino Acid Score (PDCAAS) of 1.0, the highest quality score a food protein can have.