mexican bean salad
diced carrots, frozen/canned corn, black beans, kidney and white kidney beans, cumin, paprika, some kind of pepper, salt pepper, olive oil, cilantro, and lemon/lime. toss in some diced tomatoes if you want. no actual cooking required.
to mix it up, toss in a can of tuna every now and then. its good with a crusty bread or pita bread. its filling and nutritous.
initial cost may be high to buy olive oil and the seasonings, but if there is a dollar...