You could also make your own, if you are so inclined. Just buy sheets of DBEF and sheets of plastic quarter-wave retarder film. This is a standard item from lots of companies (I evaluated pieces from American Polarizer and they were pretty good).
I know that Reveo was working on making...
contact Reveo
www.reveo.com
They make a broadband, reflective circular polarizer using cholesteric liquid crystal polymers. I think they can use both glass and plastic substrates.
Good luck,
Steve
