Order online. Several travel organizations, financial institutions and credit card companies offer online currency exchange services. The Internal Revenue Service offers a few safe resources. Order the currency by going to the website and placing the order. You can pay through the website, and they will send your currency in the mail.
Go to a bank that offers international services or an equivalent service. Not every bank may offer currency purchasing, so you will have to inquire first. To purchase the currency, take your money to the bank's international services department and pay the exchange rate, along with any required fees. The bank will give you currency.
Buy from the airport or your hotel. Travelers can purchase the currency from the currency exchanges located within the airport. They work like the bank transactions, but the fees are often much higher. Find the currency exchanges by asking airport employees. Transactions at your hotel are also possible, but come with higher exchange rates than other sources.
