Ok, this is a bit left field, but wasn't sure where else to share!
You may be aware of Airtasker - the site where people post odd jobs that others pick up for a bit of side hustle cash? Well Coles have now partnered with them. Now you can do people's Coles shopping for them (once you've met certain requirements, being completing two prior tasks successfully).
I looked up how it works - someone posts their shopping list, you go buy it, upload an image of the receipt, enter the amount and then they pay you the bill via Airtasker. You get paid whatever they offered to do the task on top of that. So you can extra collect credit card points and flybuys points by doing someone else's shopping and get paid $20 bucks or similar.
I don't know whether there will be instances of taskers getting ripped off (never receiving the shopping bill money) but I don't think it would be possible because the person posting the task must enter credit card details.
There's not a massive amount of money to be earned but I love supermarket shopping and I'm only 2km away so I'm quite keen! I'd collect Velocity or Qantas points as well as flybuys, and with all the flybuys bonuses I could pay for some of my own goods.