10% off Tickets (One Way CBD/N. Harbour to Auckland Airport $16.20/$21.60, Return $30.60/$39.60) @ Skybus
Saw this deal on OzBargain and it seems to work on Auckland's Skybus.
Auckland CBD: Airport transfers from Auckland Airport (AKL) to Auckland City with convenient stops enroute via Mt Eden and Dominion Rd.
or North Harbour: Express airport transfers from Auckland Airport (AKL) to North Harbour, including Akoranga, Smales Farm and Westfield Albany.
The North Harbour bus is offering 50% off UberX to bring you from your house/work to the bus stop.