I am travelling to Miami in May and would like to obtain US Quarter Dollar coins of the US Parks and US Territories, is there an "official store" where I can obtain them?
The only "official store" for U.S. coins is the U.S. Mint. The closest Mint facility to Miami is their HQ in Washington DC.
You can find those quarters in circulation, and any coin dealer in the area will have them for sale. On Google Maps, I see two dealers near downtown Miami.
