We shipping our products with a local shipping service, the problem for you. You need to open a account and you must stay in the dominican repbulic. It's also really expensive.
The easy way, you can check the local big supermarkt:
Super Pola
This supermarkt is in the San Juan Shopping Center 15 minutes from the airport and 30 minutes from your hotel away.
The San Juan Shopping Center is new and has a lot of diffrent Store.
Super Mercados Nacional
This supermarkt is five minutes from the airport and 45 minutes from your hotel away.
This supermakrt has a big offers of world-wide product.
You can try to call this supermarkt=) Sunny greetings from the Dominican Republic =)
Pascal