I have always had an aversion to paying retail, and so I learned to shop in the correct manner.
We eat really good, not a lot of junk food, or much that is high in carbs or fat. It means spending time on weekends, but if you think of it as a treasure hunt, that makes it fun. I always find two for one's, dollar a pound, can, etc. It really is not that hard.
You have to learn to cook, and everyone in the family does cook. We have shelves of cook books, (bought at yard sales, flea markets and auctions). We grill in warm weather and always stop at the orchards, farmer's markets and roadside vendors.
These people are absolutely clueless, and must be stupid not to mention insulated.
We have a special food deal. On the sly. Can’t go into too much detail but we get over a week’s worth of meat (plus beer, olive oil, laundry detergent, etc.) for just 50 bucks from a “mobile wholesaler.” The meat is usually about a week away from expiration but it comes frozen. Great stuff too. Typically we get a bag of jumbo shrimp as well as lots of chorizos, strip steak, pork chops, chicken, fish, etc.. Usually the beer is a 12 pack of Heineken but this time we got Corona which was a nice break. We also get paper products as well but we are pretty well stocked up on that until late summer.