I have been eyeing this partucular model and size as it has a VA panel and comparable to QN90A. The deal is not as good as the David Jones deal during black friday but I believe is lowest advertised price since then.
You can use this price to negotiate a better deal at other retailers too.
Should be possible to get under $4K.
For those not having much luck at other retailers or don't want the hassle of going to physical shops, you can also order the TV from Powerland's eBay store for the extra $100 off ($4,199).