I just looked it up to see if any fast food place had Sloppy Joes. The only thing i found is White Castle had a few different sloppy joe sliders as a limited release menu item earlier this year. They're no longer available though.
I remember reading online somewhere that a guy wanted to open a truck that only sold $1 grilled cheese sandwiches with the shitty white bread and like 1 or 2 slices of american cheese and that was it.
in my town there is a hot dog spot that sells like microwaved grocery store hot dogs for like 5 or 6 bucks a pop.
When I was in college there was a hot dog guy that would set up a trailer usually Wednesday-Saturday nights and grill up hot dogs for $2 a piece. They were so good. He’d toast the buns and you could get all kinds of toppings including chili and nacho cheese. This was before food trucks were a thing (at least in PA).
Can't beat food trailers set up next to bars. My favorite dive bar used to have this guy that would set up his little trailer on weeknights and sell Cubanos, Papas Rellenas, and Empanadas. They eventually closed because the health department found out they were operating without a license and they lied to the bar about it lol