It's not working in Argentina, just redirects to Google Finance... (finance.google.com)
I guess you could use google search instead... just google something like "1 USD to ARS" (1 us dollar to argentine peso) and grab the result from there...
The search query would be something like https://www.google.com.ar/search?q=1+usd+to+ars and you would be grabbing the result from the corresponding DIV tag...
EDIT:
In this particular case, the source code shows
1 U.S. dollar =
20.2675314 Argentine pesos
so you would grab the div with the vk_ans class.
