in store only
Not 100% sure on how this cash back works as it's not detailed in the promotional PDF as far as I can see, but if you can grab this for $699 it's probably worth the drive by to the store or a phone asking them about it.
Centrecom promotional PDF
http://www.centrecom.com.au/catalog/stockclearancesale0510V1…
If you don't have a PDF you can try my Google Docs link
https://docs.google.com/open?id=0B4LzqCfQzDAOT2lmR2dqSjB1Rlk
Official Lenovo Y570 page
http://shopap.lenovo.com/au/en/products/laptops/ideapad/y-se…
Official specs from Lenovo PDF:
http://shop.lenovo.com/us/ww/pdf/Y570_datasheet.pdf
Tried to upload to Google Docs but it couldn't show it so I took a screenshot.