At the current moment in time, a large part of the NEV market in terms of manufacturing is actually outside of the United States. The United States is the country that has the regulation as well as the market of people that are willing to purchase such products. However, the actual cars that are sold in the US as NEV licensed are almost entirely cars that come from outside of the country.
A good example of that is the Italcar EV. As the name of the car implies, this little number comes from the country of Italy. Italy is the same country that is responsible for the creation of the ultra-efficient non-electric Vespa scooters, so one can understand that they have a fine history of energy efficient vehicle creation within the borders of that country.
Another example of a NEV that is sold extensively within the United States is the REVA 2. This is a card that is manufactured in India. It counts as a NEV in the United States, but just about everywhere else in the world could be looked at as a quad cycle even though it does have a closed space reminiscent of a normal automobile.
Eventually, one would hope that domestic manufacturers start churning out NEVs on a regular basis while more people in the US purchase them. Large government employers with huge complexes like the US army purchase these vehicles in large quantities, but outside of some of the larger urban neighborhoods NEVs are not that popular.