Nope, The Sony Centre don't sell them. (our local one anyway)
They told me to phone Sony Spares (SEME) which i will do tomorrow, dreading to hear the price, its so expensive to buy from them. (over £8 for 1 set of large rubber plug things for my MDR-EX71 eaphones).
Thanx again
Jamie.
I wouldn't store anything in the bag with the minidisc player unless you want scratches all over it, especially the screens.