Logitech MX Vertical Mouse
Evoluent Vertical Mouse
This one is the best for those with hand injury using the mouse.
Microsoft Sculpt Ergonomic Mouse 6000
3M Ergonomic Mouse Stick
Orthovia OrthoMouse Wireless Ergonomic Mouse
2017-12-21 saw this on amazon. Not sure how good it is.
the reviews seem to be slightly negative.
Anker Ergonomic Mouse
This one is very cheap. There are wired and wireless versions.
EV Ergonomic Mouse
SmartNav Natural Point Hands Free Mouse
You wear a headlamp-like thing to your head, it shoots a lazer pointer, and the screen detects the pointer. So, basically you just move your head slightly to move pointer.
TrackIr 5 Optical Head Tracking System
This one is mostly gamers playing flight simulator games. It is not a mouse substitute, but supplement.
Lots positive reviews on amazon.
If you have a question, put $5 at patreon and message me.