I don't think anyone will have panels for the Skybox. You'll have to either modify something you find (which for movies will likely involve using mylars) or have something custom made, which would probably involve some sort of copyright violation.
Last year during the SuperBowl, I had recieved a damaged SB poster. I cut the bottom off and slid it into the front slot. Looked very good. You may want to try that with a poster of your choice. It doesn't even have to be double sided. It won't be of mylar quality, but does the job.
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