Over the moving process we've been up to Salta 3 times in the last 6 months and I can say that, shockingly, alot of stuff is much more expensive up there than in BA. For example, I went to a kiosko the other day in the Tres Cerritos area of Salta to buy a small Baggio juice: $8! And just today I paid $5 at a kiosko here in Colegiales. And this is quite wide-spread, at least in Salta Capital. That said, housing prices are much lower there than here.
Where we did consistently see lower prices was in Jujuy, but in my experience Jujuy has always been cheaper than Salta. Either way, $2000 sounds really low to me.