I've had good holster luck on ebay, too. I got a complete Blocker Lifeline rig for $25, two new-in-bag Hill Fas Tracs for $50, two new-in-bag Safariland 010s for $50, an El Paso Luger holster w/belt for $50, etc.
The holster was listed (is listed) as Null holster .45 auto Seventrees (ASP) - Item #3647473031 The holster can be viewed for 90 days. As to the url, I have not had any luck getting it correct when I try to copy it. sorry.
I hit the place and checked "ending today" for holsters and there it was.
It goes real nice with the ALessi full flap holster for the Commander I got there too.
Richard - I think the El Paso holster is called the M1900 or M1902; it is a ringer for the holsters used by the U.S. military during early Luger trials. I can't post a pic, but there is probably one at the El Paso website. The belt has the round, brass "U.S." buckle; it might be called an M1911 belt. I don't know where El Paso gets their model numbers, with the M1916 repro called M1940, and M3 repro called the M1942, etc.