is the following correct:
1. you see the price, say USD 1,000,
2. go to checkout they charge you ARS 252,000 official rate (252 today),
3. but you card gets charged about USD 550 (turista rate is 457, VISA is roughly following it)
if that's correct, it sounds like the scam loophole that was popular during the first days of "MEP" rate on foreign cards back in January