Sony Have 3 Years Extended Warranty On All Bravia TVs Bought Anywhere In Oz Until Dec 31st
You can buy it from any retailer, and you'll get a manufacturer warranty from Sony along with the TV.
This isn't a bad deal considering most manufacturers will only give a standard 1 year warranty, or you have to pay extra for the additional years.
*Note that if you do end up buying a Bravia with the extended warranty, you will have to register before 31 JAN 2010 for it to come into effect.
(You can pay extra if you wish to extend the warranty to a furthur 4 or 5 years)