Link is to the Officeworks site listing this as $79.00. I've seen it in two store on the clearance table for $30.
A quick check of the OW site list 3 other stores close by with limited stock - no guarantee that it will be $30 there though.
Coburg and Hawthorn had them at $30 - Hawthorn had a stack of them but they were going quickly with people buying more than one. RRP is $149.95 and the Microsoft cashback deal lists the cashback at $44.99
Hopefully you can find some more - I know the frustration of limited stock deals but this seemed good and other OW's indicate some stock (low). Call before visiting. Let's see if I make $15 on this LOL
P.S. It scanned at $79 but the guy applied the discount without me asking.
Edit: Receipt uploaded as requested http://i49.tinypic.com/25k2yo1.jpg