Currency
The legal currency in Argentina is the "Peso". The notes and coins have this appearence:
Although in many places you can pay with American Dollars (and, more rarely, in Euros), you will find that the exchange rate will not be the most convenient for you. Try to get pesos as soon as you get to Argentina. Taxis, buses and most restaurants and stores used by locals will not accept foreign currency.
Banks & Currency exchange
Currency can be exchanged in most Banks (open from 10 am to 3 pm) and exchange companies "casas de cambio" operating in the same time-range. Try to avoid exchange your money to people in the street, operating mainly in the downtown area (called "arbolitos" -little trees- by locals, since they are right beside the road).
If you arrive to Buenos Aires by plane, at the Ezeiza Airport there is an exchange company, but you will most likely get a better rate if you change at the Banco Nacion (state owned bank) located in the Terminal Building.
A good alternative, for the rest of the trip, is to get local money from your account using the ATMs spread all over the city. By this, you avoid travelling with money and sometimes get a lousy exchange rate. ATMs are found not only in banks but also in Shopping Centers (such as Alto Palermo, Paseo Alcorta, Unicenter, etc.) and many large supermarkets (Jumbo, Disco, etc.). The largest network of ATMs is Banelco (https://w3.banelco.com.ar/Extranet/De...). In the web page you can find an ATM locator. The web page is in Spanish, unfortunately.
