One of my go to cheap meals are a box of Mac and cheese(I do the one with cheese sauce so I don't have to buy milk or butter), can of glory green beans, and smoked sausage I cut in 1/2 inch slices and fry. Carbs, veggie and protein. Cost me about 10-13 bucks to feed 5 people but I'm buying 2 of everything I said. For 2-3 people would be like 7 bucks