When you subscribe, you'll immediately receive South Park: The Stick of Truth and This War of Mine with more to come and enjoy 10% off in the Humble Store!
Buy Star Wars Bundle US$1 to get 10% off of monthly bundle, making it US $10.8
In total you will end up paying US $11.8 (AU $15.86) including Star wars Bundle with US $0.20 (AU $0.27) discount than original bundle price.
Good find on the star wars discount