Auckland to Vanuatu flights are normally $600+, so this looked like a good deal.
Auckland to Vanuatu Flights on Air Vanuatu from $348
Some sample travel dates:
Dep. Wed 03/Aug/16 Ret. Wed 10/Aug/16 $348
Dep. Wed 17/Aug/16 Ret. Wed 24/Aug/16 $348
Dep. Wed 07/Sep/16 Ret. Wed 14/Sep/16 $365
Dep. Wed 14/Sep/16 Ret. Wed 21/Sep/16 $371