Offer valid 1 June 2013 until 30 June 2013, or while supplies last. Offer limited to the first 300 qualifying customers. Available in Microsoft online store in Australia. Excludes Windows 8 Pro Student offer. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or coupon. Limit 1 per purchase.
You can get Win 8 Pro for $69.99,if you got an edu email address.
http://www.microsoftstore.com/store/msaus/en_AU/pdp/productI…
http://www.officeworks.com.au/retail/landing/Windows8