After I saw this message, I went on Ebay to see what sort of grilles were there. There are a few for sale that advertise themselves as being suitable for the Toledo and the Leon as the same part, although they were only standard grilles rather than the Cupra grille?
The standard ones do seem to be quite common (probably due to alot of accidents involving the front of the car), but I had real trouble finding the chrome edged grille from the V5, so you might have similar trouble looking for the Cupra version. Considering it is a 'disposable' part in the event of a collision, it is possible that the dealer has put a reasonable price on it?