Try this guy, just bought a spare pair from him, mint condition only scuffed around the edges but centre unmarked, 95%+ new.
He will sell some on buy it now if you contact him.
http://cgi.ebay.co.uk/PIRELLI-DIABLO...cmdZV iewItem http://cgi.ebay.co.uk/PIRELLI-DIABLO...cmdZV iewItem