In Sept 2012 they did a Road Trip Australia issue which included International Post stamps in $1.65 and $2.35 and Wilderness Australia International Post stamps in $1.65, $2.35 and $4.50

July 2012 London 2012 Olympic Games $1.60 and $2.35 International Post

That is all I have time for tonight. If you scroll through the following page, picking out the stamps that have the blue International Post symbol on them you should be able to figure out the denominations available

http://shop.auspost.com.au/collectables/stamps-issues