Oh, yes. I wind up eating healthy simply because I'm poor.
For breakfast you can make muffins with pieces of whatever fruit is in season (blueberries, peaches, bananas, apples, etc.). Or you can have oatmeal (rolled oats, not instant) cooked with apple, dried cranberries, chopped walnuts, and cinnamon. Walnuts are expensive, but you only need 1/4 cup to give it good flavor. If you toast the walnuts first, the flavor is better. Raisins are healthier than dried cranberries, but I don't care for raisins.
You can make vegetable soup with whatever veggies are handy (potatoes, carrots, onion, a can of diced tomatoes, etc.) and a little chicken broth or bullion. Add spices to taste (bay leaf, oregano, thyme, garlic...); simmer until veggies are tender; serve with a dollop of lowfat sour cream and homemade cornbread.
Black-eyed peas (purchase dry, simmer 30-60 min. until soft enough to eat) are inexpensive tasty served with cornbread, sliced tomato and sliced red onion.
I adore white chili made in the crock pot. You can buy chicken thighs for much cheaper than chicken breasts, and they taste just as good in the chili. I get them already boned and skinned. Boil the chicken and cut it into pieces. Put 2 cans Rotel tomatoes, 2-3 cans Great Northern Beans, a chopped onion, 2-3 chicken thighs (chopped), some garlic, and some cayenne pepper (if you like it hot) in the crock pot. Cook on low for 5-6 hours or so. Drain the beans first to make it thicker, or omit one can of beans if you don't like so many in your chili. I like to substitute one can of black beans (drained) for a can of the GN Beans.
An easy soup called "Late Night Chicken Soup" from a college cookbook is satisfying and inexpensive. Take one can of chicken broth (costs about 50 cents around here) and simmer two Tbsp. rice in it for about 20 min. or until rice is tender. Mix one raw egg with a tsp. of lemon juice. Remove the soup from the heat for a moment or so, then stir in the egg mixture with a fork. Keep stirring for a minute or two while the egg cooks/thickens. You can tailor it with your own seasonings. I like it with a dash of garlic and za'atar. It's very good with chopped red bell pepper and basil, too, but red bell pepper is pricey.
Baked potatoes are inexpensive, filling, and very healthy if you don't load them down with butter and sour cream. Try a can of baked beans (75 cents) and some broccoli on the potato, with a sprinkling of cheese over top. I like to buy a bag of frozen broccoli pieces and cook just what I need as I go.