I don't know if anyone is aware of this but Steam is also like Xbox and PlayStation if you change regions with a VPN the price drops dramatically.
I've been testing it for the past week and it works great.
Create a new Steam Account with Argentina as the Country of Residence. This part could be skipped if you test on your main Steam account which i haven't tested at this time but a friend has and said it worked
Search the game you would like to purchase, you can look up the best deals here Database of everything on Steam and add everything to cart
Once your on My Shopping Cart turn on your VPN to Argentina NordVPN worked great.
Change your Country to Argentina you can find this just above your Cart
Check out, the only payment that worked for me was Mastercard.
I just purchased Forspoken for $37 which cost $90 NZD At the moment of making this post which is 60% off
I have also heard you can do this on Epic Games Store which you can get cheap V-Bucks and Games.
Using a VPN to bypass geo-blocks and to exploit regional pricing is a breach of the Steam Subscriber Agreement and it could result in a permanent ban of the Steam account, including it's ability to purchase and access video games or software.
One tip I saw on OzBargain