You can get 2 months free audible.com membership including 2 credits for audiobooks. You get 1 credit immediately after signup which you can redeem for a free audiobook of your choice which you will keep (even after cancellation)
You may also get a $10 Amazon.com gift certificate which...
One of the Audible Australia's best-sellers, The Rosie Project Graeme Simsion is available for free download. It's a narration about a brilliant genetics professor on a search for a wife according to his criteria.
Audible now has an Australian store and you can sign up for a free 30 day trial which allows you to download any book from Audible for free. You can cancel the trial before 30 days period or continue using the service which will allow you to download 1 audio book every month for $14.95.