Staples offers its Staples Stiner Fabric Managers Chair in Black, model no. 23559D, for $39.99. Plus, Staples Rewards members qualify for free shipping. (Not a member? Click here to sign up for free.) That's $40 off list and tied with our mention from October as the lowest total price we could find. Features include fixed lumbar support, pneumatic seat height adjustment, and center tilt with adjustable tilt tension and lock. Deal ends May 21.