[Trekfreak]

Any of you guys can tell me where I can find what I can best describe it as "clear" posterboard?

 

[fernieo]

Saw some large clear plastic styrene sheets at Hobby Lobby (18"x 24" I think) used for picture frame glass, that might work. around 7 or 8 bucks.

 

[Heavens Eagle]

You can find clear acrylic and lexan sheets 1/16 and 1/8 thick at Lowe's and Home Depot in various sizes. These sheets are supposed to be for window replacement, but I have used them for all kinds of projects.