Coles is offering free deliveries when shopping online between 1st and 5th December. Australia wide - excludes Whitsundays Coast region. Only applies to the 3 hour delivery window.
I checked this out myself after seeing it advertised on telly tonight. $0 delivery fee for any item purchased on 1-5 December (edit - standard terms and conditions seem to indicate a minimum of $50 purchase may be required).
You might want to check out some of the discounts exclusively available for shopping online only.
Great opportunity to try out the online service or stock up big time without having to carry everything home yourself.
Details appear to be a bit sketchy online but I can't see any restrictions on what you order other than the limit with dates and the 3 hour delivery window!
So, you might just want to order a Mars Bar and have it delivered for fun ;-)
Coles Online normally have a ~$50 minimum order requirement.