Paid 80 for mine with a crap debadged grille and a burgandy bonnet that was straight but covered in lacquer peel.
On average £100-£120 is a fair price, but you might drop on for less on ebay *if* you are lucky. If you are going to hold out for the right colour, you will be waiting for a while in all likelihood, and may pay a premium.
I have seen perfect ones with the early grille and complete with a bumper/splitter/front panel as well as lights and bonnet advertised for £300 on edition.