This is a Kesington Turbomouse 64210 four-button trackball. I like trackballs for first person shooters -- you get that nice, old-skool Caterpillar action when you smack your hand across the ball to do a spin-jump.
Froogle sez that this sells for an astonishing $119, which is way too goddamned much, honestly.
I'll take $20.
This is a set of chrome shelving in the style of