I ended up buying it from Truesupplier . com

$25.74 with shipping. It took 10 days to get here from Hong Kong. They supplied a tracking number that followed it fine.

Took 10 min. to install. Just pulled the BB apart, had to unplug a bunch of stuff, swapped the board out, plugged everything back in and presto!

Brand new Trackball Sensor Board with plug and play