Mastertrade have them, I noted the normal trade price the otherday was $98+gst, however I only ever pay around half that, you might find some middle ground. Othewise Aquilatech have them at more friendly prices without having to go throught the trade thing, they normally deliver next day.
I've got one, installed it new about 6 months ago. I'm now on NDSL and don't need it, but it is still installed. It is sitting on my ceiling in Pakuranga and I work in Carbine Road, Mt Wellington. PM me and we can chat off-line.