Flint River is excellent and I order it off of the internet (www.flintriver.com) and the shipping is free. If you go online you can order samples and try it out. I have my food autoshipped and they are extremely good to work with.
I have two labs but don't have to feed them as much as most grocery store products because there aren't any fillers. My two big labs get 3 cups/day and I add a little chicken broth and non-fat yogurt to it.