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milk is often declared as the cheapest source of protein (namely by Rippetoe)
Also i would prolly buy beans, lentils, etc.. and rice and fresh "On Sale" vegetables, make a lentil stew, eat it with rice and a fried egg on top with a salad on the side
Buy on sale canned tuna and make a tuna salad to eat with pasta or rice

grow your own salad and tomatoes