hi,
You can do it in the "shipping policy" in the Magento Admin panel. It is possibel to set up shipping policiies for each Listing or for a group of products or for one single product only. It depends on your requirements.
If you want to have a shipping policy for Australia and the 8 other post codes, then you can have 8 shipping policies and then apply to the listing,
Please send your store url and the magento and the postcodes as well and I cann do it,
best regards,
TGS