It's difficult to answer this question if the costs of hairdressing are so expensive in Oz. Perhaps you could go with the one good cut (maybe just once or twice a year) and get someone to pay for it for you as a Christmas or birthday present.
My mother would never touch our hair. She would make all our clothes, but she never used her scissors on our hair. We always went to the hairdressers. So, since leaving home, I have always gone to the hairdressers. I had my third (and last) child at 34, and was already pretty grey. The worst was when I went to fetch him from kindergarten and another kid shouted "Your grandmother's here!". 
As soon as I went back to work and could afford it, I had my hair streaked in my original dark colour. I keep asking them to reduce the number of streaks each time so I can gradually go grey, but we get so carried away chatting that the streaks are usually the same intensity each time!
My hair is for the main part, now completely white (snowy white, not silver) with the battleship grey colour at the back. (But it doesn't look it because of the streaks)
What worried me is, having had dark hair all my life, I didn't fancy the idea of having hair a lighter colour than my face, which I am sure makes me look anaemic. This side of 60, I am not going to start tanning or wearing darker foundation, so I am wondering how not to fade into the background once I stop earning and can't afford the streaks.