Something Pretty Close
There is a type of crab that is caught locally, at least here on the north coast called "centoyo" or "cangrejo gigante" that has a similar flavor to Alaskan snow crab or king crab. It is usually sold by the street vendors in Sosua and is caught locally.
It has large claws equal in size to king crab and larger than snow crab. There is not as much meat in the legs themselves though. The flavor is awesome because it is fresh. The only way to purchase snow crab is frozen.
They are in season now and have much more meat when in season.
Usually cost about $65 pesos a pound.