I have a microsoft trackball, black body red ball thumb driven, was $35 us/$99 cdn and I bought the first of 2 in 2000 it has not been supported for a long time. I saved the drivers to a usb and am still using the combined trackball today. The 1st tracball had 1 board die in it, bought the second the other board died in that one so I combined the 2 working boards and it still goes strong.