Campsaver has most of their food on sale for around 20-25% off and you can use this coupon code for an additional 5% off: cart-5849.
FWIW, Clif Bars and other bars are not such a great deal but the dehydrated stuff is pretty cheap compared to normal pricing, especially with the additional 5%.
http://www.campsaver.com/camp-hike/c...n=September+21