From personal experience it's about twice the cost of an ambulance ride from my house to the hospital. Air ambulances here are about 10 times as much.

Having something scheduled is cheaper than on-demand, too. You may even end up using the same equipment, but at a lower priority (it costs $200 or so to have an ambulance sit at your event, for example).

Yes, but it might be in some ancient Russian helicopter of unknown provenance.