value 12-pack of mac and cheese: $6
2 pound bag of peas: $3
tuna or chunk chicken: $1 a can or less, usually.
Make all at once, put in storage containers in the fridge, eat for a week. Usually only eating half the package of mac and cheese, and using half the peas. It's what I did to make rent back in Oregon. That and things like BBQ chicken ramen (four bricks ramen, one or two bottles of BBQ sauce, pound or so of grilled chicken. All told? $12 and it held me most of a week.