The “Logitech Trackman Marble Mouse” is probably the best trackball on the market now, under $30. The ball is not the largest, but largish, and it spins well. It got 4 buttons. Got excellent reviews, and pretty cheap. Missing a scroll wheel would probably be the only flaw.
From a physical operative mechanism point of view, the concept of trackball pretty much includes the functionality of scroll wheel. Holding one of the button, then the ball functions as a scroll wheel.
The ball diameter is 40 mm.
For replacement, you can buy at amazon
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