I've got a 22" x 24ft piece of .15 white lex sitting around that will probably never get used...
There you go, find a way to get your hands on that, otherwise you have to buy it in a 6 foot wide piece!
Proveer sells roll stock. I get it cut to size.
I was in there a while back picking up some HDU and noticed they had a panel saw set up...Hmm... I always had to cut it down to size! Well, I guess I never asked if they would cut it for me.