StarSense Hand Control Wanted

I am interested in purchasing the older style StarSense hand controller that has the RS232 interface on the bottom of the hand control. I don't have any USB devices that work with the StarSense. I am not interested in being a vendor I am just looking for the hand control so I might try some non-destructive experimentation with the hand control because I have had some success with some of my other Alt/Az mounts a some slight re-engineering. I would like to see if I can (tweak) re-engineer the hand control to work with my CEM. I would like to experiment with the unit to see if I can make it work, non-destructive type with other products. If it's the right price I may be able to purchase the entire StarSense unit.
Thanks for looking,
Terry