GNC offers two Pure Protein Large Bar 4-Packs in Chocolate Peanut Butter for $7.99 with free shipping. (Add two to your cart, the discount will be applied automatically.) That's $1 per bar and tied with our August mention as the lowest total price we could find for this quantity. (For further comparison, most merchants charge $2.50 or more per bar.) Sales tax is added where applicable. These large meal-replacement bars contain 31g of protein.