dont know what you mean about a vertical mouse.
i have a logitec trac ball, all you move is your thumb and fingers
once you get used to it a regular mouse $ucksrocks
its spendy but i have used mine daily for 3 yrs, 6 batteries killed
you can pop the ball out to clean under it (allot with cats)
i dropped my ball in the garage, took 45 min to find it.
50 at best buy, might be cheaper online somewhere