Staples offers its Staples Stiner Fabric Managers Chair in Black, model no. 23559, for $39.99. Plus, Staples Rewards members qualify for free shipping. (Not a member? Click here to sign up for free.) That's $60 off and tied with our April mention as the lowest total price we could find. Features include fixed lumbar support, pneumatic seat height adjustment, center tilt with adjustable tilt tension and lock, and more. Deal ends July 20.