You can go to the Nutro homepage and sign up for their Rewards Program. In return they will mail you a $10 off coupon. I've read on some different threads that you can get a 5lb bag for around the same price, so this could very well be free food (or close to it!).
Even if this isn't the brand of dog food you feed your dog (or even if you don't have a dog) think about signing up for the coupon and donating the food to the local SPCA. A little goes a long way!!