That would be awesome! I'd buy off you.
Just curious, you can't change money on the black market for those rates in Recoleta only in Once? Why would I need to get from the hotel to Once immediately, or do you just mean in general?
Sorry, looks like I'm not going to be back in Once.
All the jewish stores are in Once and they all pounce on dollars like hot cakes. I wouldn't know where to buy them in Recoleta.
Also it's extremely volatile, so if you're not going for a while you may want to hold off. Here are the current rates:
http://dolarblue.net/In other words you can sell on the "blue market" at 9 and if locals want to buy the rate is 9.4
I'm told you can probably find stores that will give 9.2...YMMV.