It's legal to listen in but not to do anything with what you hear, so there is nowhere streaming NZ Police / Fire.
Wellington Police have gone to encrypted digital first because they're closest to the Police IT section so easiest to babysit through the installation learning curve. I think Canterbury is next because of the boy racer problems, and Auckland won't be far behind as they want us done before that football thing in a couple of years.
Note that even after they go digital encrypted you can still listen to them, there's nothing illegal about it, you just won't hear anything you can understand.
Gary