I am looking for a supplier for translucent recycled polypropylene
sheet that is semi-rigid or rigid, not a film.

Preferances:
located near the Northwest, since I am in Seattle
Post-consumer plastic as opposed to post-industrial
Even better if it is UV stabilized  

I have seen this in some applications- notably
http://www.o2sustainability.com/.  I have already contacted people
involved in this project and they gave me a lead which hasn't evolved
into anything.