Here is some information for Bariloche:
On my second day in Bariloche, I was able to find the arbolitos. There were a couple guys on the 200 block of Bartoleme Mitre, south side of the street near the entrances to one of those inside-the-block malls. This is the third block east of the Centro Civico. Both guys I talked with were offering 10.1 pesos per 1 dollar. This rate was for $50 and $100 bills. Smaller denomination bills could be traded at 9.7 pesos per dollar. I was taken into a clothing store selling t-shirts, sweatshirts, and jackets. I did not see an address, but the store was flanked on the west by the entranceway to a supermarket and a kiosk on the east. My hotel accepted dollars at a rate of 10, but I think they were the exception, not the rule. I also saw a restaurant accepting dollars at a rate of 9. Prices in Bariloche seem to be higher than Cordoba, but lower than Buenos Aires.
Vampire over and out.