>>6963483oat meal and whole wheat bread for carbs, get the giant tubes of oat meal and flavor them with honey, cinnamon and organic maple syrup the last of which is pricey so use conservatively, chicken, ground beef for burgers avoid meats of which are grown with hormones or you'll grow man tits, canned or vacuum sealed tuna for your proteins, canned backed beans, green beans, peas, asparagus ext since veggies are cheaper when canned usually. Also cut shit out of your diet like soda and fast food.
These are all cost effective means to gaining your protein, carbs, and anything else through your greens. If you've got a green thumb I'd recommend growing tomatoes and potato too.