4-5 lbs of "on sale" meat, 10 lbs of bread flour, 5 lbs of sugar, 2 lbs of cheddar, a gallon of milk, cereal (from local mill, not the national brand stuff), vegetables, butter and lunch meat will cost around $60 here in the Upper Midwest. But if I spend that $60 on mostly processed food, I will barely get two grocery bags full.
With a bit of land you can go further. I keep chickens for fresh eggs, but I realize most people can't do that. However, my potatoes, corn, carrots, broccoli, squash, pumpkins, salad greens and some herbs come fresh out of the garden so for summer/fall at least, I don't buy those things.