Standing Desks
I recommend getting a standing desk before looking at chairs. You can get a good standing desk for around $100, while a good chair will run you $400 minimum. A standing desk also makes bad chairs easier to sit in, since you can adjust the level of the desk to fit where your arms naturally rest.
There are a lot of standing desk options, but the cheapest one is enough for everyone in our office. I’ve linked the standing desk Eli and I use. Eli 6’2 and I’m 5’7. Both of us can adjust the desk higher and lower than we’d like it to go, meaning it’ll fit people outside of our height range too. We both bought it because it was the cheapest one on Amazon, and it’s worked well for us thus far.