You just might want to look into this service, I'm going to. http://www.angelfoodministries.com/ Mods if this isn't the proper place to post this please put where you feel it will do the most good, thanks.
http://greatfoodforall.com/ Another good source for low cost food. Check and see if a group is in your area or better yet, work at starting one!
Probably not as cheap as either link, but if you don't use coupons at the grocery store you're really not shopping smart. You can get subscriptions to the weekend paper (assuming you don't have a subscription already), and you should be able to pay for the subscription multiple times over if just use a couple coupons from each weekend. I imagine your chances of saving would be even better if you had a "big" family. I mean, I only shop for two people and save a good amount of money. And sorry, if this doesn't go with the thread or should be filed under "common sense."