Where to sell a race entry ?

I am/was entered for the Vatternrundan 300 this year but have decided to drop out (new job and all that) and there is an official window of time when entries can be officially sold on to others and the new party registered as the official entrant.

I've registered the entry on the recommended local Swedish board buy havent seen anyone selling entries on Ebay or similar - so anyone recommend a place where UK roadies might be looking to find entries ?