This is a tremendous deal and one you should move very quickly on! Some people have found this as cheap as $212 but I am seeing $386 on Orbitz and directly on Qantas.com. Book now, decide/ask questions later!
The fare is available out of Los Angeles or San Francisco to Auckland, New Zealand and is marketed by Qantas.
This is a HUGE DEAL and one that will certainly not last long. I found the prices easily on Orbitz and Qantas.com.
According to View From the Wing, these prices are good for July 1 – September 1 and October 28 – November 30. According to the original source on this deal, Single Flyer, this is a minimum 7 day stay (which I think you would want anyway since New Zealand is far enough away and very beautiful).
If you have saved the Amex Offer for Qantas to your card, you should be able to match it very nicely with that. The offer is for $400 back after $2,000 in spend. At these prices, that means you could buy 6 tickets to New Zealand for a total out of pocket cost of $1,796, or $299 per person directly from Qantas. Really great deal!
HT: Single Flyer