I have one 3Dconnexion SpaceBall 5000 USB for sale.
The SpaceBall 5000 delivers the comfort and efficiency of
a proven two-handed work style with even greater performance than before.
Use the motion controller to position, view and navigate 3D models
and data sets, while directing the standard mouse to simultaneously
select, create, edit and annotate.
SpaceBall 5000 lets you take advantage of both hands on your computer.
Demand the best tools for the job and grab onto the power of your software
with both hands.
Bla bla bla... it`s awsome for 3D modeling amd playing games
Info:
http://www.3dconnexion.com/spaceball5000.htm
Supported applications:
http://www.3dconnexion.com/applicationlist.htm
It`s a 500$ device. I used it one week, since than it was in a box.
I sell it for 350$.
This is in NYC , I ship only to US.
Write me to: atka007@hotmail.com