eBay offers Mainstays MS19-D1-1015-04 Mesh Task Chair with Plush Padded Seat Black for $16 (orig. $26.96) with free shipping.

Product Description:

The Mainstays Mesh Task Chair is a blend of comfort, support and mobility. Backrest and seat cover are made of a lightweight breathable black mesh fabric upholstery. The high backrest provides a sturdy support for your back and the generously padded seat adds another layer of contoured comfort during those long workdays. 

• Back Type: High Back
• Material: Breathable mesh
• Color: Black Base
• Base Material: Durable Nylon Plastic
• Seat is generously padded with dense foam for long lasting comfort
• Dual caster wheels for easy mobility around the room
• Ideal for home office, dorm room or professional workspaces
• Pneumatic adjustable seat height
• A great fit with any home or office décor styles
• Assembly Required