Only From Draper!  And it has a ten year warranty!

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  Cinescreen®  is Draper’s line of diffusion screens.   It is a transparent substrate of glass or acrylic, with a permanently bonded optical coating. The optical coating may be formulated for varying levels of brightness, light distribution, and contrast.   
  Can be used in our Retro/QA (portable rear projection system), MultiScreen System or any of our VideoWalls in conjunction with our Projector Support Structure.
  Cinescreen  optical coatings have been formulated to provide inherent abrasion resistance. No other manufacturer offers you this protection.
  Optional special coatings 
  Substrates - Draper uses the finest plate glass and clear acrylic as Cinescreen substrates. 
Optical qualities are very similar: today’s acrylics have been improved and exhibit slightly better transmission than plate glass. Here are some other distinguishing characteristics:
      Cineglass®—Recommended for maximum sound isolation, scratch resistance, and service life. Weighs approximately twice as much as acrylic, breaks more easily, should be installed by a glazier. Available in a greater range of sizes than Cineplex: through 10' x 20'.
      Cineplex®—Lightweight, durable and break resistant. Easier to install. Requires more care in cleaning, as acrylic scratches more easily than glass. Less soundproof than glass.
  All Cinescreens are warranted for TEN YEARS against defects in materials and workmanship.