I love shopping for 'non' American products. I find it one of the best parts of our trips, trying and tasting different things.
Super U is in Marigot at the Hallowell Center (next to the French side McDonalds) Be sure to take your own re-usable shopping bags. You also need coins to get the carts out if I recall?
"It is good to do nothing all day, and then to rest"