$20 off $40 for next 3 grocery orders on Ubereats until 29 September
Based on items I buy, all prices are inflated about 10% inflated prices for Coles with around $4 service fee (if buying $40 worth) = in total $8 savings compared to buying in store for $40 spend.
That means a total true discount of $12 for $40 spend or 30% true total discount + free delivery if you factor service fees and inflated prices.
If you have items that are out of stock, but still reach the $40 spend target (must put no replacement items), you will get an overall better in discount (i.e. Order $40 stuff, if $20 item out of stock, you will still get $20 off, so you only pay $0 + $2 service fees).
Doesn't include discounts in store, so always go for items that rarely go on discount (i.e. Coles or Woolies branded, spices, frozen fish, some meats/deli items).
There is also an alternative method some Ozbargainers are secretly using on discord called 'Doordash Australia 55% Off' Discord where the user 'thehotstepper' is able to provide around 40% true total discount no delivery fees (max $26.99 order).
Warning: Use above alternative method at your own risk as it's unofficial, is not a promotion from Doordash itself and does not involve ordering through the app but through an unknown third party. But it has worked for me and many others on multiple occasions so far.
Used this recently at Woolworths and found it to be cheaper than going in store.