I can only attest personally to the suppliers I deal with offering the quality S.L.O.W. and sustainable produce I often refer to. This link is a public resource and I unfortunately cannot vouch for the ethics of all of the producers and suppliers listed. I have however made contact with these suppliers to ensure that the information I am providing is as accurate as possible.
It is ultimately up to you to ask your suppliers about the source of their produce, how it is grown, harvested and transported. Yes it may take a little time to ask questions and source the best produce available to you, but once you have been through the process, you can relax in understanding exactly what you are consuming. Happy shopping!
Also see the Australian Farmers Market Association for a list of all registered farmers markets Australia wide at www.farmersmarkets.org.au