One way flights from Sydney/Brisbane/Melbourne for $149 ($174 including baggage).
The home page of the air newzealand website says $199 but when I am actually selecting a flight it is coming up as $149.
Terms & Conditions: Offer ends midnight AEDT 30 Mar 2015. Travel periods apply, see above for details. *Travel to Auckland is valid on NZ123, NZ721, NZ729, NZ722, NZ726, NZ726, NZ7939. ^Travel to Wellington is valid on Tuesdays and Thursdays. Advertised fares are per person. Applies to direct services only. A non-refundable service fee of AUD30 per person, per one-way journey applies to Contact Centre bookings. For credit or other card payments a fee of AUD7 per person, per one way journey applies. Seats are limited & will not be available on all flights. Fares are available until sale ends or until sold out. Baggage Allowances: For economy class, Seat+Bag and The Works airfares your first checked bag up to 23kgs will be free, Works Deluxe passengers are entitled to two checked in bags up to 23kgs each and Business Class passengers are entitled to three checked bags up to 23kg each, with additional charges applying for additional bags. Passengers purchasing Seat Only fares are not entitled to a free checked baggage allowance, however bags can be pre-purchased prior to travel online via Manage Bookings or by phoning the contact centre (see rates and terms and conditions), or alternatively for a higher rate at the airport. If you purchase Seat or Seat + Bag on Virgin Australia operated flights you will not get TV Shows & games. Works Deluxe is not available on Virgin Australia operated flights. Airpoints Dollars™ are earned on all Air New Zealand flights excluding fares purchased using Airpoints Dollars™. Status Points are earned on all fares excluding fares purchased using Airpoints Dollars™. Price correct as at 6 Mar 2015. New deals may be released at any time. Airfares may be extended. Standard Air New Zealand Conditions of Carriage and Air New Zealand Terms & Conditions apply.
Travel Period: 21 Apr - 25 Jun, 21 Jul - 5 Aug, 15 Aug - 24 Sep, 14 Oct - 11 Dec 2015, 1 - 28 Feb 2016
Travel Period: 11 May - 18 Jun, 28 Jul - 15 Sep, 10 Nov - 8 Dec 2015