VariDesk standing desks are quite popular these days. If you have one of those, you may also want to invest in a VARIChair. This chair promotes active sitting, allowing you to engage your leg, back, and core muscles as you work. It also lets you move throughout the day.
The VARIChair features an air-lift piston mechanism that can raise the seat up to 32.75″. It does not take a lot of space and comes fully assembled. The chair has a weight capacity of 200 lbs. You can get it for $195 at this time.