plexiglass or perspex

Does anyone know where can I locate full sheet of clear Plexiglass or perspex its for a window of sorts or is it expensive

B&Q sell these, no idea of price I'm afriad.
Leo

Appreciate your help Leo

I found B+Q quite reasonable for sheets of perspex when I priced it in relation to builders providers, we needed to buy a fair bit for roofing over a deck gazebo and they had very good rates for the corotherm type as well as the regular perspex as well.

Loads of different rates for the types that they had but definitly was one of the cheapest after pricing around.