Easy to find, NEVER cheap. ;) I used to sell them for $5 to $10, then a local Sun guy found out I had some and he bought them all. Me too on the optical meese. I bought a CHEAP Inland brand for $8.99 at MicroCenter, and its almost weird at first using it because it NEVER skips, sticks,etc. and my brain isn't used to that. The scroll wheel spoils you real fast too. My finger is already "looking" for it on lesser mice. My understanding is that the new optical mice compare the surface image to detect movement. Fancy stuff, but isn't the interface to the PC still the same?