[12/31/2017] Gaiam Evolve Balance Board for Standing Desk 健身平衡板，Gaiam Evolve Balance Board for Standing Desk – Stability Rocker Wobble Board for Constant Movement to Increase Focus, Alternative to Standing Desk Anti-Fatigue Mat，特價$40.49 USD。Prime境內免運費 (學生可以免費試用Prime)。哪裡買：amazon 。