Sometimes it is because you are just not visiting a real farmers market...
and sometimes it's because farming in the area hasn't been competitive in decades, and cannot keep up with imports even if they cut out middle men and even if they get subsidised like hell, making you wish the government would just rip the band aid of instead of tying up workers in this industry without a future for another decade, food security my ass, what's the point of that if we aren't feeding people at all and instead turning perfectly good vegetables into bio-fuel since energy companies pay more for them then our starving population can?