A bundle of green onion costs, like, a dollar. A single bell pepper? The same. Saute them over some butter and garlic. Toss in some flour (like two bucks for store-brand), and stir. Add some spices here if you want. Throw in some random veggies you can get for cheap; mushrooms, celery, carrots, whatever really. Cut up some chicken, beef, whatever meat you want and throw it in (last night I decided to throw in an 80 cent can of sardines to try knockoff bisque). Add a couple cups cream and/or milk, however heavy you're wanting it.
It costs about ten to fifteen bucks to make this soup. Most of these ingredients you can use multiple times across meals (flour, spices, milk, cream). If you're saying that you can't afford a decent meal on public assistance then you're either a disingenuous nigger, or a lazy and uneducated one. There is nothing 'luxury' about it, just simple things you can pick up for cheap.
Grow up and learn to cook.