Amazon offers Prime members the
Optimum Nutrition Gold Standard Whey Protein Powder 2-lb. Tub in Double Rich Chocolate for
$18.41 with
free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.79.) That's the lowest total price we could find in any flavor by $12, although we saw it in another flavor for $2 less in March. It contains 24 grams of protein in every serving.