Tom,
look on ebay there are many cheaper original holsters there, but you have to keep looking.
You can create a search that will email you when a "luger holster" is listed.
Bargain holsters on ebay are not going to last long, and no one is likely to advise you of a real deal- they will buy it themselves!

There is a link below to a $50 bulgarian luger holster, there are some nicer ones for up to 100$; and a good swiss holster for 100 listed now too.
I don't think anyone said you could get a "nice" holster for $100! You will get a well used one with some issues.
Bill Wylon on this board has sold some nice holsters for $150 , you might pm him.
https://www.ebay.com/itm/VINTAGE-WW2...0AAOSw1LRaz48W
And one on GB:
https://www.ebay.com/itm/VINTAGE-WW2...0AAOSw1LRaz48W