Jetstar has just launched a huge sale to NZ. Fantastic return fares with stacks of seats across all sectors.
Fares are available for travel late January 2016 through to late August 2016. Good luck, and happy travels :)
Here are the usual screenshots:
Booking/service fees don't apply for payments made by POLi, Voucher, Jetstar MasterCard, Jetstar Platinum MasterCard, or any MasterCard debit card (using phone/mobile).