A couple years ago Mission
A couple years ago Mission Motors decided to back away from plans to manufacture electric motorcycles. The company still builds them, but solely for testing (so they say) the components they sell to OEM's. They say they're too busy designing and building components to get into the motorcycle market.
I talked with Muench guys at Daytona at the TTXGP World Championship. They say they're interested in making bikes for sale, and are willing to sell some bikes, but it sounded like they're not in a position for large scale manufacture. It's also possible to contact Lightning Motorcycles for bikes, as they're willing to build and sell duplicates of their race bike.
The race bikes I mentioned, including the Empulse RR by Brammo, are light years more powerful than the Zero S or Empulse R.