Computer Parts guys - Help!

well... my Microsoft Trackball Explorer died, due to some broken plastic internally. All buttons, etc are still here, but pieces are broken.

Now, I have found out that these things are discontinued, so I can't even go pick up a new one.

So, anyone out there know of a 'peripheral graveyard' that may have some broken specimens around? I figure I can bring mine back to life, but there aren't any parts available on ebay either.

This is the 'gray' one, with 4 buttons, and a scroll wheel, and of course the red / black 'dotted' trackball.

Any help GREATLY appreciated! Can't stand a standard mouse anymore...