The exchange rate in Argentina is convenient for the foreign tourist.
The main banking area is located in the so-called “city”. This area comprises the first five blocks (numbered 100 to 500) of San Martín, Reconquista, 25 de Mayo, Sarmiento, Presidente Juan Domingo Perón and Mitre streets.
The U.S. dollar is accepted in most shops, but it is convenient to exchange them for pesos in currency exchange offices or banks.
"Source: Tourism Portal, Ente Turismo de Buenos Aires - www.bue.gov.ar".