Where I am in New York it's a little weird. There's one private helicopter that costs a lot for rescue and a police helicopter that's free. Also if it's just the rangers that come up to save you, that's also free. But the ambulance ride will bankrupt you.
I've even heard of a guy who will hike up a mountain, call 911 saying he's dehydrated and will wait for the rangers to carry him down, only to be fine at the bottom. (He's done it twice)
