They don't support Cashrewards and Shopback.
I tried to buy Bunnings gift cards in Coles using Flybuys dollars but this didnt work. Looks like the only way is to buy Bunnings gift cards using Flybuys online and wait for a physical gift card shipped to you, which is annoying. This is not actually true saving but still…
Any other ways to save? Get discounted GC through AGL/RACQ etc?
If you've got an ABN you can get a powerpass card, that'll save you a little bit on things.
Note that some products an warranty will be a bit weird cause buying it with a powerpass card means they think you're using it for Trade use, and the long extended warranties don't apply (eg. Ozito/Ryobi). Dunno how that actually goes in practice though.