Well good luck with that! I have been on a similar quest - actually the short roll version of that reel, as I advertised here. Unfortunately, still no luck.
If anything I think the long reels (which were actually for 70mm film as opposed to the old 116/616) may be a little more common, or at least I seem to have encountered more of them in my searching. I will let you know if I come across any. Let me know if you happen to stumble upon any of the short roll reels!