Dual Monitor support arms – HumanScale M/Flex Model M104-055; 2nd Computer Monitor Support Systems: 1 & 2 Monitor Support Arms. Humanscale-brand M/Flex Monitor Arm Systems (the 'Cadillac' in versatility and appearance), new and slightly used available. Bolt through mounted. Single monitor support arm, $50 non-negotiable; dual monitor support system, $70 non-negotiable. Silver w/ grey trim. If interested, text Dave at (306) 540-6774 (Pilot Butte).