With thanks to the Whirlpool forum, JBHifi is (begrudgingly) selling Australian stock of the Canon Powershot S100 camera for $421. However, it appears the only way to get this price is with the purchase of any accessory - in my case a gorillapod.
I have also attached a copy of another receipt, should they claim mine to be fraudulent (credit to Patches)
http://upload.ozbargain.com/2011/12/13/7389_yesterday.jpg
Tip: When trying to find which store has stock, quote the SKU or product number 78391. It will speed things up.
Currently I believe the North Ryde store still has 1 or 2 cameras left in stock, but one is likely to be on display. Other stores in the area have none.
how difficult was it to bargain down? and what was their asking price?