I don't now these people, but they have a good range and the prices seem good. I have bought some of these yesterday.
http://www.windowcleaningstuff.co.uk/rubber/1037-moerman-rubber-dura-flex-42-105cm.html#
http://www.windowcleaningstuff.co.uk/rubber/1037-moerman-rubber-dura-flex-42-105cm.html#