Myer is having a sale on Toys (including LEGO) for a limited time. Until Sunday 20th October you can get $10 off for every $50 you spend. That works out to be a pretty standard 20% off deal, the downside being that you will need to spend at least $50, and spending $70 for example would still only get you a $10 discount.
You can check out the offer here (PDF link)
Thanks to TanTile for bringing the offer to our attention.