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Latam Airlines is offering cheaper business class flights to Sydney in May/June. Same as this deal but going the other direction. Next best price is $1200. It's a short flight so up to you if it's worth it.
Find the cheap dates in Google Flights then book with Skyscanner.
Play the Auckland airport scan and win game while you're there. :)
EDIT: BYOJet doesn't seem to like code.