I had a punt in Auckland in the late '90s. Pre-internet it wasn't hard to find somewhere. The adverts were very clear about what they are and where to go.
If I recall correctly it was in a large commercial building over the road from the ferry building at the wharf. The door was anonymous enough and I had to go up a large flight of stairs. At the top I was greeted by a lovely young slim girl, short dark hair, glasses, very attractive, dressed in office-type skirt and blouse. I thought initially she was the receptionist, but she showed me in to the room where there was spa bath ready made up. She got in with me and I had an assisted bath, lots of snogging, and the punt was terrific. It was, from memory, around NZ$100, which was around £30 at the time. I think I had an hour. It was a large place, quite upmarket.