I've been playing around with making playfield plastics using water slide decals. I made a traffic light for my Taxi and a couple of blue plastics for my Millionaire. It's tedious, but if you need unobtainium it might be worth a shot.
I wrote a running commentary of my progress. Click and scroll toward the bottom of the page...
http://www.jeff-z.com/pinball/mill/repair/repair.html
Many of my basic ideas are borrowed from this video...