This is the only place I could find it.
http://www.alexgs.com/product/porter-cable-7122.html
Since B&D bought out Delta and Porter Cable, they have been discontinuing alot of parts. I had a devil of a time getting a dovetail template for an old PC dovetail jig I bought. The only way I finally got it was I call Hartville tool because there dovetail jig looked identical. It turns out that it was identical because Hartville tool made that particular model for PC. I was very impressed with the level of customer service that they provided.
If you want it, you may want to get it fast. It looks like they are discontinuing this model at many places.
Amy