I didn't realize this was still a question that was being asked but Monoprix sells Sunpat (crunchy and smooth), which to my refined palate, tastes just like peanut butter at home (America). I don't notice the difference between it and JIF or HEB's peanut butter.
Now grape jelly? That's a totally separate issue. You will not find grape jelly in France. You definitely have to bring that from the US.