+1 for ebay plates.
Had one for my motorbike, it held up quite well until it ended up costing me 12 times what I paid for it in fines from Mr Policeman :bonk: Still got it, it now only goes on for 'special occasions' but looks like it's surviving fairly well.
Have PM'd you the sells ID name if you were interested.
Demon is it? The Carbon plates on my Celica were from them and were great, pricey though
I've used http://www.fancyplates.com/ in the past.