Guster , the prices you see are correct. It is cheaper if you go via Colonia and then take the bus to MVD . Makes it slightly longer.....as well.
If you take the plane the prices will be anything between 4,000 and 5,000 pesos . Sometimes it may come down to the price of the boat..
But if you take the plane you have an expensive tacis ride from Mvd Airport to downtown and possible delays.