I recently bought a PDW Radbot which came with a mount for the rear rack.

One that I had bought a year ago didn't have one. Not sure if they are new or maybe someone took it out of the box of the first one I bought? It wasn't too big of a deal because the guy at my LBS made one for me out of the post mount for $5. It looked great and worked perfectly.. I'd post a picture but that bike was stolen