Myprotein offers its 11-lbs. of MyProtein Impact Whey Isolate in several flavors for $96.99. Coupon code "APR40" cuts it to $58.19. With free shipping, that's $39 off and the best price we could find, although we saw it for a buck less three weeks ago. Each serving provides over 21g of protein.
There are lots of things Uncle Sam can't touch — so long as you play by the rules.