Compare exchange rates as they vary considerably, depending on the source you use to buy American currency. Check the commissions. Many places sell American currency commission free and will buy it back at a guaranteed exchange rate. You can often get the best deals with your own bank. Airport currency exchange bureaus often give poor exchange rates due to their prime location and tied market.
Contact your bank or foreign exchange bureau. Confirm the exchange rate. Tell the banker how much American currency you want to buy and the currency you are using to purchase the dollars. He will let you know how much you need to pay in your chosen currency.
Select your method of payment. It can be cash, credit or debit cards. Checks are not usually accepted, unless you are buying American currency at your own bank.
Make the payment. You will get your American currency and a receipt detailing the exchange rate used and commission (if chargeable).