Just found it slightly cheaper here: http://www.ultimatumgamekeys.co.uk/en/game/buy-formula-1-f1-2012-cd-key-steam.html
Hm.... my key is not Brazilian, and not American...
But is oficial, and in for me, better than paying 2, 3 times the price due to my country "nice" taxes.
I know! No problem really.Don't get me wrong, I just wanted to warn people - who knows what happens if Valve opts to take action.