TravelTalkOnline Forums Travel and Vacation Forums St. Maarten - St. Martin recs on where to buy gold coins on the island?

Scuba is correct currency (and gold) with a value of over $10,000 must be declared on exit from or entry to the US. The form to do so is Fincen 105.

https://www.help.cbp.gov/s/article/Article-1594?language=en_US