If you mean the Scorpene class subs, close to zero. Brazil only ordered 4 of them so not exactly enough to flog a few off, looking at an old DT article (9th Dec 2011) the first sub still has a fair amount to be done on it as they're still joining sections together, so it's highly unlikely they'll ditch some of their brand new toys before they've even got them.What do you think the chances are that brazil would sell some of these boats to Argentina .(hope not)
If you mean the nuclear powered sub, Brazil is currently only building one. Which they would never sell, period.
EDIT: Looking at the link icelord posted, it says (in the "updates" section) that there was a Mercopress article saying Brazils aiming for 6 nuclear powered + 20 conventional powered submarines within the next 3 decades