@kev I have never seen a mouse that is specifically for left handed people, i know you can swap the buttons around with software.

The advent mouse I have here seems to be symmetrical, so not sure if that is suitable for both.

At one time you could buy rulers for left handed people, so the numbers were written in the opposite direction so rather than 1 - 15 for a 15cm (6") ruler it would go 15 - 1.