The food from AngelFood Ministries is really good. I've only ever heard one complaint, but I've never found anything wrong with it.
cook a lot of your meals in the crockpot. buy the cheapest cuts of meat - they'll tenderize in the crock pot.
make a list of things that you use all the time and get coupons for them (
www.thecouponclippers.com is where I get mine from), then when they go on sale, STOCK UP. I have 2 12pks of Scott toilet paper stashed in my closet.. ought to last us a while, even with DS using strips of it as a flag all the time. LOL I do this for deoderant, juice.. things that I think are pretty expensive or are, for us, brand-sensitive.
Check your local assistance office to see if you're eligible for WIC. (if you have a child under 5 and you meet income guidelines) I save at least $40/month from it. Every little bit helps.
Avoid buying pre-packaged snacks.. make cookies, popcorn, granola, trail mix or keep fruits/veggies cut and ready to eat.
If you do buy snacks, buy from the cheap stores (Aldi's or an Aldi's-type store, $1 store, BIG LOTS, etc).. I get pretzels from BIG LOTS for DS that are $1 because the package is misprinted, and they're actually better tasting than the ones in Walmart that are 2/$5. Don't be afraid to try a different snack from a cheaper store. 90% of the time it'll taste good and the times it doesn't, well you learned. Same as anywhere else. Except if it tastes like crap and you have to throw it out, you're out $1 instead of $3.97 (like tasting a new flavor of Doritos or something).
Be a "sale ad" junkie. Watch prices - you'll be able to tell that one store's sale prices don't beat another's normal ones. Walmart honors other stores' ads, as long as they aren't a card-carrying store (where you have to have a card to get the savings). If you want to minimize running all over, hunt through your ads and price-match to get your savings.
Invest in (or ask to borrow one from friends/family) a vacuum sealer. I have thrown out TONS of meat/etc from my freezer b'c it got freezer burn.. even with the freezer bags and foil and saran wrap and everything else. I may just be handicapped in that area, but the $50 I spent on my vacuum sealer was one of the best investments I've ever made, and I've paid for it again and again and again..and again. (I just caught a sale where I got over 30 pounds of beef/chicken/pork for $30. After I separated into almost 40 meal sized portions, I vaccum sealed it.. It's good for 3 x's as long (or longer) than if I had just wrapped it up and threw it into the freezer. Plus, I can see what each package is.. I couldn't stand having to thumb through 15 foil-wrapped packages to find what I wanted. Here's the shelf-life chart for the sealer.. it shows how long the sealer extends the food's life..
Vacuum Packaging Guide
Stretch meals with homemade bread or biscuits (or storebought that you picked up with a coupon, so it's dirt cheap!).