OfficeSupply.com offers the Ergotech Tablik Articulating Tablet Arm, model no. TBLK-DC-ETUS-124, for $56.73 with free shipping. (Amazon charges the same.) That's tied with our mention from a week ago and the lowest total price we could find by $1. It features a 21" vertical and horizontal range and 360-degree / 270-degree arm rotation at the two joints.

Update: The price has dropped to $53.56.