I believe it would be helpful for me to have a credit card from a bank in Buenos Aires (Banco Gallicia, etc.).
I have several US credit cards but they only offer official exchange rate between dollars and pesos. If I had an Argentine card, I could pay the balance in pesos (in cash) which I would get at the Calle Florida rate for my dollars. So, is there a bank in Buenos Aires that will allow an extranjero to open an account and be issued a credit card. Most banks I have visited require the person to have a DNI or residency documentation (which I don't have since it takes months to receive). I am in Argentina about 6 monhs per year (when it is Spring, Summer and Fall).
Thanks for sharing any useful information.