£120 and £500 per 1m square sheet? WOW that's just crazy, Where I get mine it comes in 4x8ft. sheet and anything less than 4x4 sheet is considered scrap, I just bought two pieces 1/4in 4x3ft. for $10US... It's clear but they also have colored scrap but I only make reservoirs so clear is all I get.. I've also got free scrap pieces from them that is 3in. thick which comes in handy when making some stuff.