Supplement Hunt offers the CytoSport Muscle Milk Powder 39.5-oz. Tub in Chocolate for $22. Apply coupon code "2MM" to bag a second tub for free. (The second canister will appear upon applying the coupon.) With $5.99 for shipping, that's the lowest price we could find by $26. Each serving provides 32 grams of protein.

Note: The powder has a "best by" date of September 1.