For new customers only, Soap.com offers the 5 lbs. Optimum Nutrition Gold Standard 100% Whey Protein in Strawberry or Vanilla for $53.99. Coupon code "SHOPSOAP" cuts it to $43.19. With free shipping, that's the lowest total price we could find in any flavor by $11, although we saw a 2-pack deal for $40.89/bottle in June.