Quick answer: Across the ten office chairs verified on Aosom’s UK site on 17 August 2026, prices ran from £75.99 to £143.99. The best-supported pick for a standard desk is the HOMCOM Ergonomic Chair with Foldable Backrest (SKU 921-940V71LG, £80.99): a 46–56cm seat height, a 54 × 52cm seat, a class-three gas lift, flip-up arms …