score:6
One of the simplest is to find your nearest hostel in town, and go find the backpackers. Someone is bound to have just arrived and wanting the local currency (ARS), and may have USD or EUR to give you in exchange.
Upvote:3
Find the nearest friendly little tree and sell your pesos on the blue market:
Upvote:3
You can also exchange it at the airport. To do so you must have a receipt for when you first exchanged whatever currency you had for ARS. This is so that you can prove how you got ARS in the first place.