You know, I really take issue with the thought of "cheap high calorie foods that fill you up" vs fruits and veggies because from my personal experience fruits and especially veggies fill me up waaaaay faster than, say, chips and I know they're less expensive. So sure you could eat an entire bag of lays for 4k calories and 3.99 or buy a pound of broccoli for 1$ And 154 calories and be full for hours. Oh and have the bonus of not completely wrecking your insulin response.