If Brazil is not on the possible destinations on the shopping cart software then you must email the intended supplier.
Email the suppliers. It is the best way of actually knowing if they will ship to you.
Seems simple, but...
The goal is to have involved 'forum' suppliers to say "Hey, I do overseas, come over for a rate". I surely will buy with them next time.
I wasted time emailing every supplier I found the products I like to find out later that they do not ship here. Darn stuff. Had to order from european or chinese suppliers, which, generally, sell overseas.
But I prefer to search for USA quality and faster shipping, if possible.
For example, Johnson Creek juice I had to order from UK! And pay more for that, of course!
Johnson Creek excuses are that "packages are getting retained by customs" here in Brazil. Well, the risk exist but I believe the seller has nothing to do with that, I guess they get complaining emails and have to deal, in some way, with the customers and decided to suspend shipping I guess.