As you already know, Sony offers a5000 $100 cashback and I received a mail from TGG today. Spend between $500 and $999 in store or online a tech product(incl Cameras) you can get a $100 store credit of TGG. It makes Sony a5000(incl 16-50mm Lens) only $399!!
I guess it is the cheapest price for a5000 in Australia.