Bandwidth in South America is approximately 8x the cost of North America or Europe. There are almost no carrier neutral datacenters or peering where you can exchange traffic with other in-country networks without paying for transit. Most countries will strong arm you in to buying "local" for your hardware - which means using in country re-sellers that drastically mark up prices for foreign businesses.
Next to Moscow it is one of the most difficult places I've tried to put servers.
The only semi-competitive option for bandwidth in South America is Oracle Cloud, but of course that comes with it's own issues (primary amongst them being you'll be using Oracle). But if you can deal with that, a basic 2vCPU/8GB VM comes to less than 25 USD, with bandwidth costing 8.5 USD/TB.
Next to Moscow it is one of the most difficult places I've tried to put servers.