The official currency of the United States is the U.S. dollar or American dollar ($, USD, US$).
In New York you will find banknotes of $1.00, $2.00, $5.00, $10.00, $20.00, $50.00, and $100.00 (dollars). You will also find coins of $1.00, 50¢, 25¢, 10¢, 5¢ and 1¢ (cents). (100¢ = $1.00)
As a prime example of capitalism, the one thing you will not lack are banks and cash points in NYC.
The best way to save on commissions is to pay with your credit card. When paying by card, the exchange rate is current and the maximum fee, depending on the issuer of the card, is usually 1%.
The easiest option is to withdraw dollars directly from cash points in New York City. If you prefer to exchange dollars from your local currency, you can do this in banks or in any bureau de change.
We recommend you ask your bank what commissions they apply for withdrawing dollars; this way you will be able to see what option is better suited for you.