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Best Choice Gadget via eBay offers the Ergonomic Mesh High Back Executive Computer Office Chair in Black [ebay.com] for $ 47.85 with free shipping.

Product Description (provided by eBay):
Ideal for the work place or home office
Adjustable Head Rest For Complete Comfort & Head / Neck Support
A comfortable fabric seat and mesh backrest with black frame, armrests and castor wheels
It has a gas lift lever under the seat which adjusts the seat height