Sadly there isn't any similar system to the Boleto Bancario in place here. I'd say the only valid methods would be bank deposits, transfers, cash and possibly some sort of payment service via SMS or calls such as Dialcoin offers. Opening an organized exchange here could be an extremely profitable venture, there is a sizeable segment of the population that already turns to online currency exchangers to fund their online purchases, send money overseas, etc. so that's a huge pool of potential users right there.