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@Vince
£8.89 brand new from Wiggle or Halfords.
http://www.wiggle.co.uk/miche-fixed-track-sprocket/
http://www.halfords.com/cycling/bike-parts/gears-drivetrain-cables/miche-1-8-track-sprocket
It's going to be hard to get a decent used one for cheap unless you want to swap yours