[ska]

Where can I buy these great tasting heirloom greens at half the price of which you speak?

I have no problem finding mediocre produce at a low price point, but quality produce at a reasonable price is often hard to find in major north american metros.

I'm open to the idea that technology will continue to change the landscape here, but I think you are underestimating the difficulties. I may be missing something here, but the successes I see touted in areas as you describe are things like the plethora of nitrogen bagged greens all over the continent these days from California. Certainly a commercial success and for access, but the produce itself is often pretty dismal and the process I understand is very specialized. Not a categorical win, then.

[Spooky23]

It's harder because our wacky economics make it more desirable to plant a subdivision that to farm. I'm fortunate to live in an area where prime agricultural land is relatively untouched and several prosperous farms are around.

[underbluewaters]

I just ate tomatoes last night that grew wild out in my yard that are better than any I've ever bought at a grocery store. That includes "local" and "organic". Produce in US grocery stores is shit.