JB,
These wrenches pop up on Ebay and others sites on occasion. I believe Cornwell, Snap On and one other manufacturer were the primary suppliers.
I got lucky. I showed a picture of this wrench to a guy at work. He is kind of a tool nut. He proclaimed that he had one. I didn't believe him. He brought it in the next day. I bought it withing 20 seconds of seeing it.
It is a great tool, but after seeing it, with some average metal working skills, a similar and effective tool could be made dirt cheap.
Tim