VitaCost offers a 4.3-lb. Jar of Optimum Nutrition Performance Whey in Vanilla for $39.98. Even better, buy two for $79.96, then apply coupon code "SPDVAN43" to get a third jar for free. With free shipping, that's $6.20/lb. and the lowest total price we could find in this quantity by $37. Deal ends November 1 at 9 am ET.