I screwed up and now have an extra 3" Imperial PS/2 trackball.
The unit has the groovy game gear trackball booster kit (better encoder wheels), white ball, and come with 3 Happs buttons.
You can pick the color of the buttons (white, black, red, blue, or mix and match). The buttons are the long ones which work great in 3" wood or metal.
I'd like to get $40 shipped for it.
Thanks for looking
-Goz