Manyyears ago, there used to be a Duty Free Store in the terminal at Port Everglades, Fort Lauderdale. Some cruisers bought liquor there and had it delivered right onto the ship. That is long gone.
I think that may be like what you are talking about but I don't think it exists anymore.
You are permitted to bring wine and champagne on the ship with you.
It won't be duty free but some people lug it aboard. Remember..... If you are flying, you cannot carry liquor bottles on board an airplane.