Realspace Mesh Ergonomic Task Chair: $100

Office Depot and OfficeMax has Realspace MFTC 200 Mesh Multifunction Ergonomic Mid-Back Task Chair on sale for $99.99 ($130 Off). Free shipping, or select free curbside pickup where available.

Note: This chair comes with a 5-year limited warranty and has 4.6 out of 5 stars overall from 1,915 reviews.