I have heard if you bus it into Brazil you can avoid the visa process. This is only something I have heard via word of mouth, so you might want to look into it a little more. Also, check out -snip-. They had a really good article about the hidden costs of South America. When I entered Chile, I was stunned to have to pay 160 entrance fee. Turns out we do the same thing to them.
Hope your travels are going well and you are living the dream, one day at a time of course.
[ Edit: Sorry, no promos please. ]