The jig is easy to build at home with a piece of hardwood, two screws, a drill, and a V router bit (which you'll need to make the footed shafts anyway). The original one I made and posted on the Stickbow site ten years ago took me a few minutes to make. I had a tutorial online, but it went away when Geocities closed down.
If anyone would like detailed photos, I'd be happy take some and email them. There's no reason to spend that much money on something that you can make yourself in a few minutes. Just shoot me a PM with your info, and I'll try to get something together tomorrow.