UPDATED: Sydney Symphony Orchestra's 10% promo code AUSSO01
The promo code is provided by Sydney Symphony Orchestra but requires no actual subscription for the code to work (as anyone in Sydney could be considered a patron of the SSO).
I also recommend joining Emirates' Skywards for free, as you can earn 12000 points per person with these flights (2 people = 24000 points which is almost a flight to NZ)
Also getting a Citibank Emirates Platinum Card for first year free you can get perks like lounge access and chauffeur to the airport.
Pity it is ex Sydney only