I've ordered two from eBay, both under £10. If I had seen the second one first I would have just ordered that. I don't have them yet so can't say how good they are.
http://www.ebay.co.uk/itm/1916982611...%3AMEBIDX%3AIT
http://www.ebay.co.uk/itm/3613919048...%3AMEBIDX%3AIT