I have a new Dalite executive electrol that I might be selling. It looks like it might not work in my room. It currently has a glass beaded (yuk!) 8'x6' screen, but Dalite will ship out a new tensioned 80"x45" that will pop right in. The new tensioned screen retails for $1100, so it could be had for about $800 (discounted). The quote I got was for the perforated material, so another material would be cheaper yet.
I am not sure what I will be asking for the executive electrol, probably between $700 and $1000. Let me know if this type of thing might work for you.
I planned on replacing the (unused) glass beaded screen with a High Power, which would be 52"x92", and only cost about $250.