big fan of Logitech Trackman Marble. I own like ten of them. I use them everywhere. They are indestructible, they don't require batteries and they occupy a fixed space of my choosing. With them I can easily navigate the large real estate of my dual monitor setup. Polish the ball with a little Pledge and your cursor flies cross the screeen with a little flick of the wrist.
Also, they are ambidextrous, so you can switch to left-hand mousing when the right wrist is starting to hurt.
They are indeed everywhere: https://imgur.com/1toYn6A
Googling “wired trackball” finds quite a few available from a wide variety of sellers and manufacturers, and Logitech clearly thinks they still have them.
https://www.logitech.com/en-us/product/trackman-marble