Check this out. I found out about this today............
http://www.auspost.com.au/philatelic/stamps/stampshop_2.asp?pid=414155623&product_type=8&category_id=533&product_id=2902
http://www.auspost.com.au/philatelic/stamps/stampshop_2.asp?pid=414155623&product_type=8&category_id=533&product_id=2902