There is 20% cashback at Dyson when you order through the Cheddar app. This is capped at $100 and cannot be used to order spare parts or accessories. Minimum $200 spend to avail cashback.
You may be also able to get $20 signup bonus when you download Cheddar from https://www.getcheddar.com.au. I am not sure if the existing $50 signup bonus still works using https://getcheddar.app.link/web50sup. More info OzBargain
On no Not another app :)