IIRC the original prop maker was a swordsmith/weapon maker in Hollywood (can't recall the name) who also sells to the public (NOT cheap). Going backa couple of years, simple Yahoo or Google research turned him up.
The guys name is Tony Swatton.
Here's his site: http://swordandstone.com/
He does sell some stuff but I doubt that he'll sell replicas of that particular piece.
I don't know, give it a try. But like PHA said, don't expect it to be cheap.