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ErGear Direct via Amazon [amazon.com] has for Prime Members: ErGear Single Monitor Arm Desk Mount w/ 3-In-1 USB 3.0 Hub (for 17-34" Monitor) for $ 49.99 – 50% off when you clip the coupon on the product page – 10% off when you apply promo code 10ABO8B7 at checkout = $ 19.99. Shipping is free.

Note: Coupons are usually limited to one per account.