rare as rocking horse sh*t they are. took me a while to get hold of mine. if you haven't already done so i'd post a similar request on cliosport and it might be worth PM-ing Matt Black over there as he breaks a lot of Clio's.
I take it you've also tried some of your local breakers too? Might get lucky sometimes......
prices vary, sometimes there's bargains to be found but most people cotton on to the £££ value of the interiors now and charge up to £200 for one.