anything with dry beans is cheap and healthy.
Pinto beans - per lb. of dried beans (soaked overnight and drained/rinsed), put in crockpot (or cook on stove) with 1/2 cu. oil and 1/2 tsp. salt. Serve topped with things (s. cream, corn chips, etc.)...I just had them tonight with nothing but hot sauce...
Black beans and rice - cook black beans like above...then add sauteed onion and garlic, vinegar. Stir in cooked rice.
As sides, sauteed kale or spinach
Roasted root veggies
falafel
Bean soups with water instead of broth (or broth if you have it)
Veggie soups