Years ago I used to spend time in NZ when I was part of the US Antarctic program which stages out of Christchurch. In the late 90's when I was going down there, one of the airlines had my favorite promotion ever: for NZ$99 (about USD$59) they would give you a round trip ticket to somewhere. You'd find out where you were going after you bought the ticket, and they'd guarantee it was a same day round trip. I always thought what an incredibly fun and cheap way to spend the day in a beautiful country.