If you’re dealing with the aches and pains from sitting in an old office chair and are looking to replace it with a new one, you’ve come to the right place. Staples is currently selling the Union & Scale FlexFit Mesh Swivel Task Chair for just $99.99, which is 66 percent off of the original $299.99 price. This specific chair is the chair of choice among Reddit’s chair nerd hivemind at r/buildapc, so you know it has serious staying power. Plus, I happen to own this exact chair model and can confidently vouch its comfort and ergonomics. I’ve been using it for years at this point! Looking for mor…