This is the good stuff (for the dog, not me) and is recommended by vets.  All you have to do is go here, join the club and receive 6 coupons for $5 each.  One per household.  Those bags are about $13 each, so this cuts the price by more than a third.

My mother buys this for her dog so she signed up, I signed up and my sister signed up.  We just saved Mom $90 in dog food.  Dry dog food is something you can stockpile if the coupons expire too soon.