Buy it on ebay. Or, It turns up used around here. If you want, I'm sure I could get you one for ~$14US (~43 Reais ) plus whatever it costs to ship to Brazil.
The extended version of T2 is on both the Ultimate and Extreme Editions. There's also a super-extended version with an alternate ending thta's only on the Ultimate (though the scenes are included as extras on the Extreme).