The dealer who ended up with mine took 5 months to sell it, it ended up back at a SEAT main dealer and the price was quite competitive compared to others about.
If you have the time I would try the usual Autotrader, eBay, SEAT website but also look at large none SEAT main dealers. Often they will get one in part ex and try to retail it on. Dealers who are part of a larger group usually have their own website where you can quick search group stock.