Kogan Dual Monitor Mount (Gas Spring) - $49 + Delivery (Free with Kogan First) @ Kogan
I believe this is the lowest its been. Remember to cancel your Kogan First Free Trial membership after checkout.
I made an order just as I posted this and it says delivery by tomorrow in Sydney.
Supports 10-30 inch monitors
VESA Size: 75 x 75, 100 x 100
Weight Capacity: 9kg (per arm)
Inputs: USB 3.0 x 2
Tilt: -85° - 15°