Found this one in Costco. Looks like its almost 186$ cheaper than JB Hifi whereas 239$ cheaper compared to Good guys.
Product details and Specs in this URL : http://www.sony.com.au/product/kdl-42w670a
JB Hifi - 896$
Good Guys - 949$
Hope this helps.
In before someone complains about the $60 membership cost required. You are able to refund it at anytime during the 12 months and get your $60 back, even after using it to purchase stuff. Just remember that if you do, you forfeit your bonus Costco warranty on stuff (which allows you to return items to Costco for an exchange for a reasonable time outside of the standard manufacturers warranty).