I have a beat up old Kensington mouse from years ago. It's falling apart. When I went to go get another one, I could not find one like it anywhere. I ordered so many different Kensingtons and could not fine one remotely as good as my old one.

This served me up a valuable lesson. When you find something you like, immediately order 1-2 more. By the time the one you have is ready to be replaced, you may not be able to find one like it.

To this day I still go to eBay to see if anyone is selling one like my old Kensington mouse. Still no luck. But I keep looking.