I bought one of the jigs new a while ago and was disappointed when it appeared new templates were being made of unobtainium. I did some research here on the web and found the company below still sold them! I called them and they explained. Porter Cable once sold the templates as accessories, they now sell them as parts. Places like Rockler and Woodcraft don't sell parts so, once the item number for the accessory was changed to a part number these templates no longer existed to Rockler, etc.
I bought the box joint template. Although their web site says they have one in stock the truth is, they order it from Porter Cable, they get it the next day and ship it out immediately. The best news is all the templates are available and are from the original manufacturer. As I was searching for this template myself last night I came upon this web site and found there were others looking for these as well so I really joined this forum just to pass along what I learned however, I may just hang out a while.
Go to toolsandmore.us and search for omnijig 7116