So DuPont is selling a product called “Armura.” It is a kit that can be installed on certain cars that resists handgun rounds up to .38 special. This appears to be roughly equivalent to NIJ level I body armor. This is accomplished by adding Kevlar panels to the interior of the body panels, and by changing out the glass. The kit adds roughly 200 pounds to the weight of the vehicle, which would likely have little, if any, effect on gas mileage. It costs about $12,000 to up armor a vehicle with this kit. The kit is available for the: Toyota Corolla, GM Vectra (same chassis as the Buick LaCrosse or Chevy Malibu), Honda Civic, Mitsubishi TR4 (similar to the Montero), Hyundai Tucson, Honda Fit, GM Agile, Kia Soul, Kia Sportage, Mitsubishi ASX, and the GM Cruze.
It makes me wonder if there would be a market for this in the United States. I think if a company get the armor up to a IIA rating, expand vehicle availability, and could keep the cost where it is,there would be a brisk number of sales to be made. Preppers would love it.