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8. Bananas
Potatoes and Oats can more than cover your carbohydrate needs, but bananas provide a cheap, tasty variation. A single banana provides around 30 grams of carbs, and prices are almost always well under a dollar per pound. You can also combine a banana with a whey protein shake after a workout for a quickly digesting blend of carbs and protein.
9. Olive Oil
Though it is more expensive than other oils, olive oil is still a very cheap source of extremely nutritious mono- and polyunsaturated fats. You can cook your eggs, meat, and potatoes in olive oil, and skinny guys can even add it to a shake to easily up their caloric intake.
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10. Tuna
Last but certainly not least on this list of muscle-building foods is canned tuna. Even with rising food costs, a can of tuna still costs well under a dollar and provides 25 grams of very lean protein. You can also buy tuna packed in oil to get twice as many calories for no extra cost!
