I went hunting Siege Wave 3 deluxe at a few K-Marts today.
Dandenong: Bust
Burwood: X1 Red Alert, which I bought
Brandon Park: X1 Red Alert left. There were a couple of employees hanging around the toy section, so I asked Tom (pleasant young man) who told me that "someone picked up all the Refraktors this morning, but I think we have a Brunt left". He checked out the back and returned with a Brunt, which I bought. Clearly, he either knows TFs or he's been asked the question enough times that he knows the answer.
They also had X2 SS Ironhides (I got one) and X2 SS 05 Optimus Primes (the battle blades one I think).
Endeavour Hills: Still have the 2 I saw on the weekend - a Prowl and a Chromia. My wife checked here for me yesterday too, so I suspect they haven't put wave 3 out on the shelves at all yet.