Go on thomson cruises and go to FAQ you should get it there or if you know someone thats going on any of there ships to bring you price list home.
I know its 21.00 for hair up i didnt save the list but thought it a bit expensive for the beuty treatments prob same as here i.
I had a cut and blow dry and it cost me £40.00 over a year ago (on the destiny) The hairdresser didnt speak much english and cut one side of my hair about an inch longer than the other. I looked like a mushroom when she had finished backcombing it. I suggest You have it done before you go.