Given this set hasn't really appeared in many (any?) 20% off eBay sales recently, this seems like a pretty great build-away price, with delivery in time for Christmas. Afterpay is a massive bonus, too, with this price effectively mirroring the current Myer eBay coupon.
Normally retails for around $649 (double VIP points at lego.com.au at the moment but set is out of stock) and based on previous OzB deals this isn't far off an all time low (within ~$30 of the fantastic David Jones sale, I think).
I don't use any gift or reward cards so I'm unsure if there is capacity to drive this price lower still.
Gonna need a bigger stocking to put this in.
Was $486 from David Jones recently