Flights to Australia — No fee for stopover in New Zealand
Air New Zealand is offering free stopovers in New Zealand on flights to Australia. You can also stopover in South Pacific destinations, such as Cook Islands, Samoa or Tonga for $100 each stop.
http://www.airnewzealand.com/airfares_offers/web_specials_flights/flights/cheap-flights-to-australai-and-new-zealand-usd1098-kau8u.htm