Source for thin smoked Lexan?

[artdutra04]

Another fundraising event, another capital improvement for the team. This time, a 36" Vinyl Cutter for Team 228.

Among it's other uses for making banners and custom team shirts, I'd also like to use it to make team and sponsor name/logo decals for Lexan panels on our robots. I was never really impressed with the legibility of text on clear polycarbonate, so I'm looking for "smoked" grey polycarbonate for robot panels, a la Team 148's Tumbleweed.

Since this is one of those things that's usually forgotten until like two days before ship, I'd rather purchase some stock now to avoid that problem. After doing quite a lot of searching through the usual sources (McMaster, MSC, Grainger) and a few local plastics suppliers, I wasn't able to find anything thinner than .118".

Is this the minimum thickness commercially available for smoked polycarbonate [that's still cost efficient]? Or do thinner sheets exist? (0.040" or 0.062" wall polycarbonate would be ideal.)

Thanks in advance.