I had a very poor experience with Ezeiza when I was there in February. They had quoted me an excellent price via Whatsapp and told me that they would take a credit card for 10% more. When I got there, they told me that they could not take credit cards. I had no pesos so I went upstairs to try and get some from Western Union, but they had none. I ended up having to book a taxi from one of the places outside of arrivals, and they were more expensive than I place I had been told about inside (but they would not allow me back in to find them). Of course, it will still cheaper than paying with US$ at the non-blue rate.