Saw those already....my best result has been from ProFit Intl where they simply use the old fashioned belt clip (which also acts as an awesome hanble when pulling the BB out of the holster). The suction cupped arm is also portable allowing me to switch it in and out of different vehicles...
If your looking for something to hold you BB upright in your car so you can see it while driving....
I have one of those no-slip pads on my dashboard. I put an extra desk cradle on it and set my BB it in while I am driving. It works great! I get excited to look at it while driving and imagine how cool it will be when it has GPS and is running a driving directions program.
If your looking just to carry it on your hip...
I bought a case on ebay for it that covers the handheld and has a button on back that slip into a belt clip holder. I like it alot, but stopped using it. The button is in the middle of the back of the unit and swivels around all the time. I don't like the way it looks when it is hanging upside down on my hip. Silly, I know, but its true.