Seems BigW is sending out PS4's ordered recently, I ordered on the 21/12/13, they don't seem to have stock in there online store but it mite be worth calling, my final order was actually done over phone as I had tried to cancel part of my order and the whole order cancelled, after that their PS4 page on their site was unavailable, pretty happy they did it over the phone.
BigW manages their deliveries for online orders very differently, the items are sent from the suppliers or their central warehouse even if the store near you has stocks. I cancelled my click and collect order after it was not dispatched for a couple of days and I found out that the nominated click and collect store had stocks. You might want to check out stocks at local store