I use a Logitech M570 trackball and have for a long time. Looks like the M575 is the latest version.

M575

And my chair is from Staples, a Sorina. Think Amazon sells them too. Comfortable for me, has flip-up arms which makes it easy to play guitar, and fairly inexpensive. The material does flake off after a while though.

Sorina Chair


My stuff:
https://soundcloud.com/scott-h-olson
https://www.youtube.com/@ScottHOlson

Sonar Platinum, Studio One Pro 4, Windows 10, Hybrid Home Studio