trackball with scroll wheel

[robk97]

I know logitech makes several, but I wondered if anyone knew of any others. I have a marble mouse (which is in fact a low end trackball) and love it, but I miss the scroll wheel and having 6 buttons.

 

[IamDavid]

don't bother with any other. been through 4 myself now..
http://www.amazon.com/Logitech...an-Wheel/dp/B00004VUGJ