Just received a email from Shopping square, it said it has a "Pre-Order Sale - Up to $120 Off 'The New iPad' WiFi and WiFi + 4G"
The best price for this sale is a 16G WiFi white version. which is $423.05 + shipping to Sydney $29.95. totally $453 make it about 15% cheaper against to Apple official price.
The disadvantage for this Pre-order sale is: "Item will be dispatched in 3-5 weeks after payment confimation"
Direct link for 16G Wifi version is here: http://www.shoppingsquare.com.au/p_400128_Apple_The_New_iPAD…
Mention it's only the white one, black is still a lame deal ^.-