at the price of that quote.. I personally would buy a new wing and unbolt - bolt it on!
my mates just brought the aftermarket new painted ebay ones.. they'll be arriving soon.. and i'm giving him a hand fitting them! from the reviews we read.. some people said they are not as good as the original (as in quality) which is to expected! but they are stunning and a perfect replacement! someone else said they don't fit well, where as another said they fit lovely! so whether that's down to the DIYer's doing or not I'm not sure.
for £100 i'd go down this route though.. unless you can get a lot cheaper quotes elsewhere.. but seriously don't pay over £500+