I am not sure how long it has been like this for and how long it will last but Home gift cards are 12% off for those with Member Advantage. Note that they do charge 1% CC surcharge.
Retailers include JB HiFi, House, House Bed & Bath, MyHouse, PetCircle.com.au, Pet House, RobinsKitchen, The Good Guys, Amart Furniture, Baccarat, dusk
Member advantage is available through a range of organisations, unions, employers etc
Mod Update 29/07: Based on the screenshot that OP has provided, these appear to be Ultimate Home and not the TCN Home Gift Cards.
Free to access if you are a member of one of the unions or professional organisations listed under the link.
Lots of discounts available.
I use them a lot.