You don't have any pet stores close to buy food from? How about your vet's office? Petsmart? Petco?
Any food that you'll find in Walmart or the grocery store is really poor quality.
I think everyone looking for a pet food should read this article from the Animal Protection Institute:
http://www.api4animals.org/facts.php?p=359&more=1
If Walmart is your only option, I'd order food online. Besides the ones already mentioned, Innova is good, Castor & Pollux, Blue Buffalo and Wellness are good, too.