When I want a little sweet treat I make smoothies.
My base is always frozen banana + milk + oats then do one of these:
Cinnamon + vanilla
Pumpkin + pumpkin spice+ brown sugar
Strawberries/blue berries
Cost like under a dollar to make a good cup and they are pretty filling.
… okay but which snacks are peak for a dollar?
I do remember when I was young though I would go to dollar tree and they would sell a pack of fudge covered graham crackers, and those were amazing.