Just noticed this when I did an order today - if you spend $100 at Coles, select Click and Collect and then enter CLICKCOLLECT10 at checkout.
It ends up being the best deal for the supermarkets so far since you can actually have a $90 order as C&C is free.
Ends on Tuesday.
Just keep in mind that items that are available online are generally a bit more expensive that if you buy it in-store. I think it is to cover the cost of picking and packing the items.