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Hi Orfeo,
I've been thinking about exactly the same thing this week, having recently read the article re the sun funnel. Having not had much luck either, my attention has turned to businesses that use and/or repair rear projection screens. For example a big user of the material is the national firm Staging Connections. They have a branch here in Hobart and I was intending to talk to them next week, hoping to get lucky and find they have off-cuts available. I'll let you know if I have anything to report. Perhaps this might give you some ideas.
Cheers
Steve
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