While I'm sure there are plenty of Mexican ER horror stories (just as there are plenty of US ER horror stories) I know a guy who needed surgery in mexico, got excellent care and was told the bill was 200. When he told them he couldn't afford $200,000, they said, "No, $200"

EDIT: Okay, I was mistaken. It was a friend of a friend, but here is the story:

Not long after arriving here [Mexico] she got a serious liver infection, and, after putting it off for too long had to be rushed to the hospital. She ended up having to stay in the hospital for half a week and was seen dozens of times by her own doctor and others before they released her.

As a hospital administrator, the whole time she was there, she kept adding up the things that were happening to estimate what this was going to set her back. She'd guessed in the realm of four or five thousand dollars, so when they handed her a bill for two thousand dollars she was quite pleased.

"Two thousand dollars — that's a lot less than this would have cost me back home."

"No, no, senora, you misunderstand — that is in pesos; about two hundred dollars."