Are you after 'places' to get them done?
Hey if you got a steady hand (and patience!!) you can do them yourself, head down to repco or super cheap and get the kits.
Much cheaper than through a tinting shop and in some cases just as good, depending on your patience and attention to detail when you do it.
You might experience trouble on the back window though, usually you just do it in two halves to eliminate the bend bubbles, saying this it is quite tricky to get it right.
The other windows just pull them out or take off your door interior to get at the bottom.
Apart from that! google man you will find some cool shops. What part of NZ you in? if your in CHCH got to 'Tint My Ride' he's in the phone book.
Peace.