I suppose the-powers-that-be are unfamiliar with shoppers' own "grocery watch" which really costs them no additional outlay and isn't taxpayer funded. Check it out here at Boy on a Bike. You don't need to access the www to get to it, it's delivered to your letterbox and/or in your local rag each week.
These people, the ones advocating Fuel Watch, Grocery
And they're funded by the Australian taxpayer.