Allotments 4 All

Does anyone know where one can get large black and fairly sturdy plastic  sheets cheap?

I've done the usual seaching of skips, etc but think my area is exhausted now.

I posted this last week, if it helps?!
http://www.allotments4all.co.uk/smf/index.php/topic,36185.0.html

Many thanks and appologies for not searching first - dashing visits and all that!

Although still a little more than I was hoping to pay - but then I'm tight.

No Si D - not tight .....just careful!

Twinkletoes