Local Online is Astronz (
www.astronomy.co.nz ) and his prices and response isn't too bad but his stock is limited.
I'm buying my 10" mirror from Bintel in Sydney as he won't have anything I want before the end of the year. Even Bintel won't have it till end of August.
Welcome to NZ anyway, you'll get used to the Queen's English spoke as it should be after a while.
And you'll find good darksites only half an hour drive out in the hills of the Waitakeres looking west out over the Tasman. You might even spot our cuzzies across the ditch on a clear night ....