The other thing you can do is just come to South America and ask around. I have met a lot of people down here that have done volunteer work... I think it would be pretty easy to find once you come here.
Also, if you are interested in going to a Spanish school a lot of the schools can place you in a volunteer position as well. I met a couple people that started in a Spanish school and then continued to the volunteer work even after they had left the school.
Good luck!
-Kadin
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