2 days only! 20% OFF site wide at Vitamin Shoppe with coupon code GET20NOW+ Free Shipping over $25 (see all the protein deals here). The price for the box of 15 Power Bar Protein Plus bars drops from $27 to $21 ($1.4/bar) + Free Shipping. 4 flavors available. This is the lowest shipped price we could find by at least $6 Each bar is designed with 20 grams of TriSource™ protein: a proprietary blend of soy, casein, and whey proteins. And, there are no preservatives or artificial flavours.