Argentina version of Minecraft for Windows is $3.80 +tax & service fee. Use code "GGDLS8" when checking out for 8% off your order.
Use a VPN to change your region to Argentina before logging in to Microsoft’s code redemption page: redeem.microsoft.com
Once the code has been redeemed, you can play Minecraft without a VPN enabled.
I purchased two codes and both were received immediately and worked without any issues.