Wednesday 27 July 2011 6.59pm
For adults or children? If children, the pound shop in the Elephant had some small plastic ones earlier in the year (will only hold the weight of a small child) they also had some standard height ones too. Ikea have some fairly sturdy plastic ones at £4.99 http://www.ikea.com/gb/en/catalog/products/90176641#/70050812/
You might be able to sell them on ebay afterwards?