See this statement:
I unfortunately also have to announce some rather disappointing news for our Argentinian and Turkish communities:
Effective immediately, we're raising the price for Eco in these regions to mitigate abuse via Steam region changes.
As other development studios have recently observed, we also see a very notable increase in purchases there while the player counts from these regions don't raise accordingly.
We are really sorry that we need to take this step and hope that Steam will soon address the problem, so we can keep the effects on all the players living in those countries as low as possible and lower the prices to what they were before again.
At least for LATAM region we work with Nuuvem who sell region-locked keys for still affordable prices (though notably more than the three USD it was before), so there is an alternative for users living there.