I have one. It was tough to find and I got it from classifieds here on the forum. I've contemplated letting it go, as I've only had it on a keyboard for a short time and packed it back up. The main issue with unloading it back in classifieds is that it's an expensive set, as I bought it for $200.
Outside of one appearing in the classifieds (or me selling mine), like someone said above, getting a proxy to search for you might be the best option.