Self explanatory!!
Limited to first 5000 cards registered.
Not sure about bank issued cards
Could try and combine with this https://www.ozbargain.com.au/node/152929
Edit:
Kogan Link
http://www.kogan.com/au/
OFFER TERMS
Offer only applies to spend on this Card. It does not apply to spend on any supplementary Cards on this account or any other American Express Cards you might hold.
Card Members must spend $250 or more, in one or more transactions, on their saved Card online at kogan.com, between 05/08/14 and 8/09/14 to receive a $50 statement credit.
Spend must be billed to your Card account between 05/08/14 & 08/09/14 to be eligible for this offer. If Kogan Online does not charge the spend to your Card during this period, for example because of a delay in dispatching your goods, you may not be eligible for this offer.
sorry, link?