That\'s because they oversupplied in AUS while they undersupplied in the U.S. and initally in Japan.
It\'s seems Canada also got an ample shipment. I think I agree with Sony\'s decision: you can either piss off everybody or just piss off one region. They couldn\'t fully meet demand for the U.S., even if they used all their units from Candada, AUS, and Europe. So they might as well cut the U.S. short so they can make sure at the very least the Canadians and Aussies are happy.