Just a thought.
Try
http://www.ebookreaderstore.nl/irex-dr800s.html
Ok, it's in dutch, don't know if there is an english version of the website.
It seems they are willing to sen it to Brazil.
The advantage of a dutch seller is that the irex is built in the Netherlands so they should have no problem with availabilty.
I bought mine just of the shelf in my dutch town at
www.selexyz.nl
They have also a webshop but also in dutch.