St Hilda’s East Community Centre is very close to my house and occasionally (I think it’s at least twice a week), they set up a couple of tables in front of their building with mostly local produce run by a local co-op. I’m a firm believer in buying local whenever I can -much more than buying organic from Peru say. Their prices are fantastic so it’s very much worth a visit.
They’re also looking for volunteers whose travel and lunch expenses would be paid. This is their twitter account for more info: @StHildasEast