chrisas tj says seeking out your friendly dealer is first step, not all will bother with closed auction's.
be prepared to pay a deposit as this will make them work harder in your interest and will show them a genuine buyer.
release dates will be announced later and bear in mind they may be used as recce vehicles for the following challenge as did the 52 plated for the 06 challenge and the 55 plated for the initial recce for the 09 challenge
regards
martin