I am home and hosed on this one if we chose to do it LOL! Within 160km of me there is a flour mill (and we sell them wheat we've grown), we are in the Riverina, which is the food bowl of the state. I love shopping at coles over at Griffith because they tell you what is sourced locally, so you can buy that instead of stuff from out of town, plus the butchers get their livestock local, and Wagga has a farmers market once a month. The only problem I would see would be the sugar, but then there are plenty of locally based apiarists for honey.

it is a fascinating concept and I think you'd be pleasantly surprised at what you can find if you look for it.