3-Button Mice - An Endangered Species?

eschasi asks: "eschasi recently got a new job, which includes a new PC on which to run UNIX and X. After much grovelling through the vendor catalog and the used equipment boxes for a simple 3-button mouse, he finally had to bring one from home. Shortly thereafter he was browsing the local CompUSAs and BestBuys, and saw not a single actual 3-button mouse. Oh yes, there were things which masqueraded as 3-button mice, but they weren't. They were scroll mice where you had to depress the scroll to get a middle click, or where the third button was under the thumb, or where the third button was unreachable because of the scroll. Sun's still come with 3-button mice, so there must be some being made. Are these still in the retail market anywhere? Frankly, they're too small for eschasi's big hands. The only place a basic 3-button mouse was found for sale was eBay, and they guy selling it called it 'rare.' Is the classic 3-button mouse largely dead? If so, what are you folks moving toward?"