Currency in Saint-Martin (French part) to euro (EUR €). For 9.9 US dollars you can get 8.53 euros. For 99 US dollars you can get 85.3 euros. And the other way: For 9.9 euros you can get 11.5 US dollars.
And if you plan a trip to a given region of the world, maybe cheaper than in Saint-Martin (French part) will be in nearby countries? See prices in: Anguilla, Saint Barthélemy, Saint Kitts and Nevis, Antigua and Barbuda, and British Virgin Islands.