Privately held companys don't trade stock or publish reports ( except for one or two), so all this info is not public. I have been told by a few folks that 3,000 to 8,000 units is about the range for any "normal" product i.e. not a Paris Hilton dvd.
Keep in mind that if you ever come across this info, posting it or making it public in any way would probably land you in a very big lawsuit.