If you don't absolutely need to have it delivered, you can sail right up to the float at the boatyard for a short while (or, even better,
dinghy there) and there is an excellent supermarket (Leader-Price) right next to the boatyard. There are
shopping carts that you can "rent" right at the
dock. It's less than a block away, and it is well stocked and
cheap, especially the French-branded canned goods, and of course the wine is excellent and dirt
cheap. We love French
food and used Leader-Price to stock up months of supplies (we're still finding their canned veggies in odd lockers two years later).