I've been pondering on a Logitech cordless trackball mouse here. You can look over that model at
http://www.newegg.com/Product/Produc...82E16826104125 Office supply stores charge something like $99.95 for that model!
The rf models don't seem to see the same problem of switching into 3D mode when simply going to lift the mouse up off of any flat surface. That was one comment in response to the review seen at
http://gizmodo.com/gadgets/review/lo...why-285753.php