Fun back window

My son came out of his flat to find the outer skin of his Fun back window shattered. He's a student and I'm unemployed so we're hoping this window isn't special just to Skoda Funs. However it is part of the unique aspects of the Fun so we're not hopeful. Could anyone tell us:

1. Is the window specific to the Fun, if so any idea of the cost?

2. If it isn't what is it?

3. Does anyone have a Fun they're breaking or know where we could get one at a reasonable price.

As always thanks for any advice - there's always someone who knows the answer.

Slembo