Irina, were you able to get a cashiers check for US dollars here?
Doesn't someone from the U.S. Consulate in Curacao visit Sint Maarten regularly to provide services to US citizens like passport renewals? I know I have seen advertisements listing when they visit Sint Maaten. For people in Curacao, they let them pay in Guilders or Dollars, so I couldn't see why they wouldn't do the same when they come to Sint Maarten. I've also found where the Consulate in Barbados sends someone to the French Side as well.