I simply cannot find grape jelly at the supermarket here.
Iceland has no tradition of PB&J--in general, I have found that most of my European friends dislike peanut butter as a rule, so I'm just glad that I can at least find crunchy PB in the store.
So right now, I'm using a "Four Fruit" jelly of some kind, with strawberries, raspberries, blackberries, and--the one I don't like so much (in jelly)--cherries.