Not to mention, if you're really local, you can beat out the competition in freshness and probably delivery costs as well (beyond a certain critical threshold of local customers at least). It's the resurgence of the milkman.
That's the best idea I've seen in this thread so far.
Taken one step further with the farm-to-table concept, I can see suburban delivery of local meal kits directly from nearby farms on a subscription basis. It becomes a value-add on the CSA concept.
In my area we have a pretty big concentration of high-income earners in relatively close proximity to small farms. It could probably be made to work in a situation like that.