Hey guys, I'm new here. Found this site after getting a wild hair to work on the aero of my '92 LeBaron sedan. I've done a grille block and underpan so far (and not noticed the gains I was hoping

) and am looking to add some sort of wheel covering.
So, my question is, where to buy plastic sheet type stuff to make parts out of? So far I've been using 20ga steel sheeting. $14 for a 120"x20" roll of steel isn't bad but I'd like something lighter weight and more flexible especially for a tire spoiler. Any suggestions?