And your air ticket is going to cost a lot more than that. The painful part is that you have to fly to a city with a Brazilian Embassy (LA, DC) inside the USA and stay there for a week while your visa application process happens.
https://travel.state.gov/content/visas/en/visit/visitor.html
However Brazil does not require an interview in person, so you can do it by mail
Also, did they say why you were blacklisted? Was there a time where Brazilians were denied entry to the US on tourist visas?
Also if you're from the US you can enter Brazil between June 1 2016 and September 18 2016 and stay for up to 90 days with no visa due to the Olympics - no need for Olympics ticket either.
BTW there's also a Brazilian embassy in San Francisco.
SP is where most of the fiber landings are, so if you're in the networking business, you're probably stuck there.