Given what that is in pounds and how much you pay in the UK already for any colour other than black or white (tornado red is now no longer "free"), I don't think that's an excessive amount.
I'm probably going to order another GTD this year and the colour issue is one that I am concerned about - I never really liked any of the colours much and the LSG I have was my attempt at "something different". Having had it now, I'd not get it again but the other choices are so meh.
So I would be paying my money for something I don't really want any which way!