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In that case, the Argentine peso is so transient that no one can really predict what will happen to it, there has been so many crashes there in the last 10 years and the rate of inflation is estimated at 40%. It may be more valuable in the next few weeks but the point is fairly moot considering the price of a last minute flight to Argentina would negate the savings.
There’s also two exchange rates, the official and the ‘blue dollar’ rate given at cambios in the street. I took all of my spending money in cash with me as you are unable to get USD inside of Argentina and the exchange was 9 peso on the official rate and 15 peso on the blue rate (although that rate was in Buenos Aires, whereas the blue rate in El Calafate was 13) whilst I was there. Pay for everything in pesos that have been exchanged in the north and you will save yourself a whole lot. I met a few people who had been skinned by expecting Argentina to be like most other SA countries where you can just get USD out of an ATM.
Crossing over to Puerto Natales, Chile from El Calafate, Argentina is the easiest and most common way to get to Torres del Paine. The coach is fairly cheap and takes about 5 hours. Look around for hostels, they can be gotten for <$10USD per night. If you're a US citizen then there is a charge for crossing the borders, I'm a UK citizen so I don't really know about it in too much detail but research it before you go. On my trip I entered Argentina twice and Chile once.