After making literally dozens of phone calls I finally found a local supplier who actually stocks this. You can buy by the foot - rolls are 2.5 feet wide.
There is an instructional video at:
You can cut a shape and place it or I found that cutting a piece larger than needed and trimming it carefully with a really sharp blade works well. Just don't go all the way through and scratch the paint... Ya a bit of practice helps. It's about 7 bucks a square foot.
113- 2323 Boundary Road.