My husband gets his hair cut at Murray's on a regular basis.
I have been there once for a colour but havnt been back since. I was given a quote but then told when I paid on the way out that she was charging me more because my hair was thicker than she realised. The polite way to do this would be to tell your client when they sit in the seat not at the checkout.
114 Church St Timaru 7910
NZ Association of Hairdressers