The place I got mine, and the only source I ever found for the three-ball version, is OOB. He used to be a member here but was terribly affected by the death of his beloved Yorkie "Lexie" (she used to ride everywhere with him, in a custom-made enclosure that sat on top of the gas tank).
After she died he closed his business, sold his bike and all the gear (too many associations that caused painful memories) and took off on a nomadic kayak voyage. I don't recall seeing any posts from him for a few years now.
AS for the dingus itself: I liked it. It mounted easily and was a good place to attach doodads. At various times I had my phone, a GPS, and various cameras in place all at once. I stopped using it as a camera mount because the images picked up reflections off the back of the windshield, but for mounting other gizmos it was very handy. An assortment of RAM arms of various lengths was handy to keep things from colliding with or overlapping one another.