My friends and fans in law enforcement & intelligence aren't too happy to see this, I was amazed that this isn't considered an AOW, and can be bought just like any other H&K or Kimber...
http://www.stingerpengun.com/index.htm
The cellphone guns are no joke, sorry this video is so small, I can't find my own copy I had that was bigger and a little more detailed.
http://www.mobidirect.com/cellgun.mpg