B&H Photo-Video offers the Opteka SteadyVid PRO Video Stabilizer System
, model no. SV-PRO, for $149.95
with free shipping
charges the same.) That's $449 off list and the lowest total price we could find. It reduces shake, stabilizes video on cameras and camcorders of up to 5 lbs., and features an adjustable mounting plate, gimbal, built-in spirit level, and two additional, removable weights.
Update: Of note, 47th Street Photo via Amazon also offers it for the same price.