Originally Posted by M60_to_LGA

I'm not sure what you mean by cash being king in Argentina. Cards are accepted almost everywhere in the country; the question is what conversion rate you'll get with a foreign card. When I was last in Argentina in 2019, hotels were required to post their prices in pesos and accept payment in pesos. With the international chains, if you book through their international reservations system you'll almost certainly end up getting quoted a dollar price that will be rather less attractive than what you could get. I'd suggest checking the peso price online or with a phone agent, then calling the hotel directly and seeing if they'll quote you a better rate in pesos directly. Then you can get pesos however you want in Argentina.