On 13 Dec 2011 01:20:15 +0000 (GMT), Theo Markettos
wrote:

One thought was HDPE chopping boards (Tesco Value and friends, or
from the pound shop). Anyone have any other ideas of a source of cheap
uniform-ish flat plastic, somewhere between 1mm and 12mm? Is there some
supermarket or Ikea product that can be abused?

http://www.ikea.com/gb/en/catalog/products/50153123/

2mm x 37 cm x 29 cm, 2 quid pack of two, polyethylene.

I've seen temporary signs made of plastic shaped like cardboard: two flat
surfaces and a wavy bit in between. Usually cable-tied to things, easy to remove
the eyesores...

Thomas Prufer