Items are used, but tested & working.  From a project I never quite got around to finishing...
GroovyGameGear TurboTwist Spinner.  This is *not* the push/pull spinner.  It is from 2006.  Plugged it in this morning, and it works fine.  Includes USB cable. $35/shipped.
3" USB trackball with mounting plate.  Also tested & working this morning.  This has the translucent 3" trackball, which can be lit from underneath.  The wiring harness was split, so each button is doubled and/or lengthened.  $50/shipped
IPAC 2 board with mounting feet.  $25/shipped.
I'm not sure about my pricing...if it's way off, let me know.  If you want to buy more than 1, I can take a bit of $$ off the top for shipping.
Thanks.