Hold switch fell off.

[happygal16]

Hi, I have been coming here for a while but never posted anything, but a little while back my Zune 80's hold switch (not the whole thing but just the little plastic part) fell off. My zune is well past the warranty (I got it about 2 years ago) and i dont want to pay whatever Microsoft will charge me to send it in. Does anyone know where I can buy the plastic piece? thanks a lot!