Check back a couple of pages in the forum. I seem to remember a thread about this recently. Yes, I'm certain there was one, and someone posted a link to some really well priced window film that he was happy with. The bus came out looking very sharp.
I started to use a household window tinting at one point, but decided against it because it was partially reflective, and in looking up my state's l aws on window tinting, reflective tinting is not allowed (although I don't think the law is enforced very strictly based on what I've seen on some cars around here).
Do find that other thread. It was fairly recent, and the link was a good one.
...other than that, I look forward to learning from your experience!