If you take a route taxi (red-plate) it should be JA$100 per person to get to the roundabout. There, you switch taxis and it should cost another JA$100 per person to 3 Dives. Hiring a driver (again, look for red license plate) to take you all the way to 3 Dives directly will be more like JA$1000 to JA$1500 total, but this is just a guess.