http://item.mobileweb.ebay.co.uk/viewitem?itemId=220921648368&index=24&nav=SEARCH&nid=71383948339
Same seller has listed 50mm for £300 delivered.
@NCGee started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
http://item.mobileweb.ebay.co.uk/viewitem?itemId=220921648368&index=24&nav=SEARCH&nid=71383948339
Same seller has listed 50mm for £300 delivered.