Obviously what the first poster is telling you is to get a membership in one of the courier services: Business Mail, CPS, EPS, and many more. Compare services, prices and their accessability to you. Traffic is a witch in Greater Sto Dgo, as I am sure you know.
Then you will tell Amazon your name, account number, the address that they give you in Miami or somewhere close to Miami, and you provide them with a phone number (I use my DR phone number)
Amazon will ship to you at the courier's office and they will then bring it quite promptly to the DR office for you. I use both Business Mail and CPS (Caribbean Package--or Parcel--Service)...they are both pretty good.
That is the ONLY way to get stuff here.
HB