TexasCHLforum.com

I have no idea about the reliability of this seller, but one is for sale on Glocktalk:
http://glocktalk.com/forums/showthread.php?t=1062604" onclick="window.open(this.href);return false;

If you are an NRA instructor or RSO you can get them at a substantial discount. I am assuming they still have their instructor program, I haven't checked this year but they had it the last two years.