Lenovo offer the Ergotech 7Flex Dual Monitor Mounting Kit for $257.99. Coupon code "EXTRA5" cuts that to $245.09. With free shipping, that's the lowest price we could find by $11. It's compatible with FLEX & VESA displays and has a full extension range of 24".

Also available is the Ergotech 320 Dual Monitor Arm Mounting Kit for $144.99 before coupon, $137.74 after. With free shipping, that's the lowest price we could find by $3. It is VESA compatible with a 23" extension range and has a desk clamp and grommet mount. Deal ends April 3.