Was looking for one of these and this is the cheapest I have seen it.
Think you should get quidco on this to.
* Product Description: Ergotron MX Desk Mount LCD Arm - mounting kit
* Product Type: Mounting kit
* Mounting Components: Articulating arm, desk clamp mount, grommet mount
* Recommended Use: Flat panel
* Recommended Display Size: Up to 30"
* Flat Panel Mount Interfac: 100 x 100 mm, 75 x 75 mm
* Max Load Weight: 13.6 kg
* Material: Aluminium
* Colour: Polished aluminium
* Manufacturer Warranty: 5 years warrantyhttp://www.ergotron.com/Products/tabid/65/PRDID/56/Default.aspx