[f00zz]

When I was in Argentina a few years ago there were money changers peddling dollars on every corner in downtown Buenos Aires, at a time this was illegal (Cristina was president).

[maxilevi]

Funnily enough they are called "arbolitos" (small trees). Because they are stationary and have green leaves (dollars)

[technofiend]

I can still hear them chanting "Cambio, cambio, cambio" and it's been a few years. ATMs give hardly anything and charge a large fee per transaction as well, so it's no surprise people go to arbolitos.