I did a little looking into things for you and it seems as if they are obsolete? I take that to mean that they are no longer produced, and, as a result, only available while supplies across the world remain.
I got that information here:
http://www.pro9.co.uk/html/theproshop/main.php?P=product&pid=CUEX0002
They do have a "Contact Us" section. It may be worth trying this option, as they may be able to direct you as to where to go.
I did try eBay, and found one user who actually sold one, still in the package, back in March. I'm not sure exactly when they were discontinued. I imagine it was either not that long ago, or perhaps this person just had one lying around, and decided to sell it.
https://www.ebay.com/itm/Billiards-...cue-stick-stabilizer-Model-25101/183098919511
You may wish to reach out to them as well, and see if they have another one lying around that they wish to part with. I've also had a pleasant experience with an online store on eBay. This store is a dealer, and was one of the few places I could find the tips I wanted for my cue at a reasonable price. While on eBay, check with joerackem. I couldn't find any in their store myself. But, they have decent customer service, and may be able to direct you the right way. Hope this helps you get started.