Saw today at Myer Loganholme (Hyperdome) Brisbane, sign up in the toy section saying - 30% off Transformers 20th to 22nd August.

I haven't seen it advertised, and Myer has been known before to have discount sales to just one state, with other states to have theirs in following weekends - so this could just be for QLD Myer stores.
But if you know a Myer near you has something you are interested in, check it out to see if the sale is on there as well.

(but with prices like $40 deluxes, $45 PCC 5-packs, $150 Ultimate Bumblebee... 30% off will still be more expensive than BigW and some other sources.)