Acer Aspire AS5750 Notebook - 39.6cm (15.6'') HD LCD LED Backlit Display, 2.3GHz Intel Core i5 Processor 2nd Gen, 4GB RAM DDR3, 640GB HDD, Webcam, WiFi,hdmi, Bluetooth 3.0 & Windows 7 Home Premium - Black
$79 Cash Back only valid until 31st October 2011 and needs to be redeemed within 14 days from the date of purchase on Acer Website.
2 year warranty
This appears to be a better deal: https://www.ozbargain.com.au/node/55134
Benefits include USB 3, 8GB RAM, 3 year Acer warranty. Slightly smaller HDD and little more expensive but probably worth it for the extended warranty alone.