Catherine Jinks - Genius Squad (out in the US Apr 2009)
Maureen McCarthy - Somebody’s Crying
Sophie Masson - The Case of the Diamond Shadow
Isabelle Merlin - Three Wishes (out in the US Nov 2009)
Beth Montgomery - Murderer’s Thumb
Felicity Pulman - Willows for Weeping
Moya Symons - The Walk Right In Detective Agency: Open for Business
Moya Symons - The Walk Right In Detective Agency: High Crime in Milk
Unfortunately only a couple of them are listed on amazon.co.uk at a reasonable price. I have used the Australian Online Bookshop in the past to buy Australian crime novels.
Update: the winner, announced 21st August 2009 was Genius Squad by Catherine Jinks.