Russ Murphy, greater Minneapolis, was the inventor of the rest. It was produced at his machine shop. Mr. Murphy, avid pool player and supporter, died a few years ago and I'm not sure if they are making this product anymore.
You can contact the shop at:
dmm@murphymachine.com <dmm@murphymachine.com>
Let us know if they are making them. They are one of the best products out there to permanently attach to the player table for holding cues. If they are available, I do recommend them to all the ROs out there.
It's possible that one of the rooms you saw them in might have a few back-ups. They might sell one to you.