I've bought a fairly cheap office chair around 3 years ago which I've been happy with. For me the solution was to go to a few stores and actually sit on a bunc

I've bought a fairly cheap office chair around 3 years ago which I've been happy with. For me the solution was to go to a few stores and actually sit on a bunch of them until I found one that had lumbar support at the right height, and mushy enough on the actual seat and armrests. Nothing but the seat height is adjustable on this model, but at the end of the day I spent 1/5th the cost of the cheapest Aeron chair available at the time. With that said, no chair will save you from the wrong posture. Which also means: never ever, ever, ever consider using both the laptop's screen and inputs as anything more than an "emergency use only". At the very least either use an external monitor, or use external K&M with the laptop on top of a very tall support that puts the center of the screen right at eye level.