I'm told it is 20% off for all Toys this Saturday (9th October 2010) at Myer,
Also: their current Toy catalogue has about 20% or more off a range of LEGO, and that ends 10 Oct.
ref: http://catalogues.myer.com.au/portal/dcproductlist?No=15&Nner=15&Ntt=lego&Ntk=Primary