We've gone with Lexan (
2007) (
2009)
We've gone with printed cloth (
2010)
And we've gone with laminated paper (
2011)
We prefer the laminated paper just because it's easy and light, but I can understand your frustration with it.
We've never had a problem with our Lexan breaking when we used it and we kind of abused all of the robots that had it. Also we just printed the logos out on a decent quality printer and taped them to the Lexan, the quality is fine and you wouldn't have to find a sticker supplier.