I don't think Mercado Livre accepts Paypal, so unless a member of DBF also lives in South America, I don't think they can buy anything. Mercado Livre used to only accept payments from South American bank accounts. I'm not sure if that is still true.
Do you own any of those other figures xtreme? Could you post pictures of Beerus, Whis, Vegeta in saiyan saga armor, and others next to your Figuarts Gohan?
You could probably make some money selling Brazilian figures to DBF members xtreme. You have a lot of figures available to you that we don't in the US!