Just to clarify, that’s instant pudding and not cook kind?
(I’m not the world’s best cook. Lol)
In 13 I post a pic of the box(es) I usually get. It’s cheap.
Baking aisle, I think. Along with the marshmallows.
Pineapple (crushed be sure to get crushed) and Fruit Cocktail on canned fruits / vegetables aisle (at my store).