Sabine H
Google
Huge selection of groceries, including local foods and imported/international products. Also good for souvenirs (local rum gift pack, bois cheri tea, spices etc). More pricey than street food but great quality and selection.
Note for vegetarians/vegans: many vegan products available including simply V cream cheese, plant milk, vegan meat alternatives - be sure to try the plant based "popcorn" from the freezer area, those are super tasty & crispy soy balls chicken-style.