Make sure you goto a hobby shop that sells model trains, styrene tubes and sheets are used to make parts of dioramas and things in model trains, I ran into the same problem as you, i have a local (half hour drive) hobby shop on the military base, and he sells all kinds of planes, and military vehicles, and a small section for automotive modeling, he had no clue what evergreen styrene was, he showed me some other type of plastic card and thick insulation like styrene that alot of the war hammer guys use for dioramas, but i had to goto a shop that sold model train accessories to get mine.