oni, you will find that generally the prices between Australia and New Zealand are pretty much exactly the same (for retail prices).
Just comparing the prices on the New Zealand apple store and the Australian apple store for the current iMac's (NZ = $2349, $3099. AU = $1999, $2649) - after allowing for the differences in GST, the ratio of the Australian price to the New Zealand price is about .87 - somewhat lower than the current exchange rate of .92 - :?: :!: :?:
I think the price on Austalias store is for direct purchases to the school, and not neccesarily to end users (so the price may differ).
I can't speak for Oni, but it is possible to use the Education store available under 'Other Stores' from the right hand menu on the Australian Apple Store online -
http://store.apple.com.au -
If you’re a student, teacher, administrator or staff member, you’ll get special pricing on a full range of Apple and third-party products. Buy for yourself or for your school.
- all you need to do is blink at a few screens (like some NZ users have done with the Australian iTunes store), click here and there and you're in. (In the past I've also just asked people in Australia via email what their educational pricing was.)