How much does this cost to the nearest dollar?

Ergotron – WorkFit-LX Sit-Stand Single Monitor and Keyboard Arm, VESA Desk Mount – for Monitors Up to 42 Inches, 7 to 25 lbs – Polished Aluminum
The modular and flexible design of the work fit-lx fits most any space while providing personalized ergonomic positioning. This stand-up desk system enables complete control of focal distance and the position of the keyboard relative to the monitor screen. The LX offers unparalleled range of motion, easily accommodating a user's sitting or standing posture. Features include 20 inches (51 cm) of height adjustment and 62 inches (157 cm) of side-to-side movement. Broad compatibility Fits single screens up to 42 inches diagonal and 7 to 25 pounds; compatible with VESA patterns and separate accessory VESA Bracket

Price is $550.00
Price: $549.99