Napoleon said:The "coin problem" disappeared about 6 months ago.
Banks give you rolls of 20 pesos without batting an eye.
Chinos, Farmacity's, & McDonald's will give you AR$3.50 in coins or more just because it's easier for them.
I haven't heard anyone struggling for coins in over half a year. Maybe nearly a year now.
The coin problem disappeared well over a year ago. In December of 2011 we could go to any Banco de la Nacion and get 100 pesos in coins if you wanted to.