$750 - Fly to Great Barrier Reef, Australia from SFO
Well, technically, you will be flying into a town called Cairns, in northern Australia, which is the typical jump off point to the Great Barrier Reef.
In addition to the Great Barrier Reef, here are more attractions in Cairns.
$750 includes all taxes and fees, and these flights have a quick layover in Auckland, which is more or less on the way.
Try doing a flight search for November 25th through December 2nd for starters. Flight time is about 20 hours each way.
As with all flights to Australia, there are usually fees of about $150 tacked onto all routes, so flights are often more expensive than advertised.
Qantas is also offering discount flights to Australia, but their prices on flights to Cairns are not as cheap as Air New Zealand right now.