Marketplace
MYREWARDS
This is from the Motor One Rewards program but should work for everyone.
5% off Home Entertainment (so TVs and such) and Home Appliances (so heaters, coffee machines, etc.)
No expiry date as far as I can see, although you may want to see if the 10% off Kogan branded products works first: http://www.ozbargain.com.au/node/80193 (that code expires at the end of the year).
Enjoy!
Does not work on phones, the kogan screen shot is a little confusing on this deal. Oh well.