Used to have one but it got lost in a move.

It's a gizmo\clip\arm that holds an A4 sheet of paper and sticks onto the side or top of a monitor.

There's one here: http://www.fishpond.co.nz/c/Stationery/p/Innovera%C2%AE+Swing+Arm+Copyholder

But customers are saying it falls off after a short time.

Anybody know where I can buy a good one?