Where can I buy nintendo wii nunchuck parts?

I have a wii and the thumbstick on my nunchuck controller got chewed off by a friend's pet dog, so i need a new thumbstic part but don't wanna spend $20 for a whole new contoller, so where can i buy the thumbstick by itsself? i already have the special screwdriver for it and know how to take it apart cause i do led modding for wii motes and nunchucks.