I also need to get me one of these. But at these prices I think I'll wait a few more months.
http://www.ebay.co.uk/itm/SIGMA-SLIP...item2eb8b5db15
http://www.sigmaperformance.com/slipperclutchrange.html
£650 for a clutch!!! Dont think you can get these second hand to be honest. No one will be willing to part with one once they have them fitted