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YESDEX Monitor Arm: Single $19.99, Dual $39.99 Delivered (60%-65% off) @ AUSELECT AU
(www.ozbargain.com.au)
I bought the dual Heymix from Amazon for my Dell 32" and I wasn't happy with the level of stability. Typing (on a standing desk) caused it to shake just enough to make me feel uncomfortable.
I returned it and picked up a Prism which is much sturdier.