I went in to banco Supervielle the other day to cash a cheque and, noticing that I was a foreigner, the guy at the counter out of the blue told me that any time I wanted to draw cash out with my foreign credit card, just come into the bank, skip the line and I can take out cash at the counter without any fees. That one is one Cordoba Av down near Puerto Madero, but I assume other branches, and maybe other banks offer the same service.