Carbs - oats, sweet potatoes, potatoes, whole grain bread, brown rice, quinoa, berries, apples
Proteins- chicken breasts, canned chicken, canned tuna, smoked meats, eggs
Fats - almonds, peanuts, walnuts, real peanut butter
Vegetables- any
All the basic staple foods are relatively cheap. The trick is knowing how to cook them and combine them in delicious ways!