Hi,
I had a clutch go a few years back on my is200, happened at about 70k, Lexus dealer was really helpfull and said that it shouldn't go that quick so I got discount, ended up paying for a whole new clutch fitted (actuator and plates) by them for under 200 quid,
Probably get it done cheaper elsewhere but I reckon I got a fair price, and would be cheaper for just the plates
Col