We were into Cheetos. The original ones, not the lumpy new fried ones. When those came on the market, chip sales hit a slump.
My parents gave me 25 cents for school lunch in 1967. Cheetos were only 5 cents. You do the math
I'm not sure that Dr Pepper (10 cents) and three bags of Cheetos (15 cents) constituted a balanced lunch, but it was more interesting than whatever the cafeteria had for 25 cents a tray.
BTW I ate some Tomato Soup & Grilled Cheese Sandwich flavored Lays this week and it was interesting. But way too much salt to eat at my age.