You stated that Argentina's peso to dollar ratio is at ars$90 to us$1 but that figure is yet another fraud. One cannot buy one dollar for ninety pesos. That is the government's "official" dollar/peso rate. The real cost is between $140 to $160 per dollar.
If there were a real way to buy dollars for $90 here, people would be buying a hundred dollars for ar$900 and turning around and selling them all day for $1500 - rinse and repeat. No, that is not possible.
Also: The country uses dollar pricing for real estate and other large purchases - they are needed here.
If you use your credit card to buy something on Amazon, you will be be buying things at the official ($90) rate but you can be indicted under 'capital flight' laws, not to mention that the customs fee will be equal to 100% of the cost of your item.
Yes, it is messed up, but it is home.