They must have sold out the stock they had in Australia, as it has reverted back to being US stock, for AU$249... with a 1-2 month wait.
If the listing definitely had stock from Amazon Australia, then they should end up getting more stock in, as we had similar problems with Omega Supreme last year, in that they were not holding onto much stock at one time, so it would take time to restock from the Hasbro warehouse.