The Opteka SteadyVid PRO Video Stabilizer System looks very promising and also got some recent reviews (see the unboxing video below). For a steadycam tool it it very cheap - especially when filming with the Panasonic GH2 or soon hopefully the D800 or 5D3 this will be my tool of choice: just ordered myself one. Here is the Opteka SteadyVid Pro on Amazon.com.
The Opteka SteadyVid PROis a video stabilizing system designed to reduce shake and stabilize video on cameras and camcorders weighing up to 5 lbs (2.26kg). The SteadyVid PRO features aluminum construction, adjustable mounting plate, comfort grip handle, super-smooth gimbal, sprit level and includes 2 removable weights in addition to the main counterweight.
* Supports up to 5 lbs (2.26kg)
* Adjustable mounting plate for on the fly precise balancing
* Comfort grip handle
* Super smooth gimbal for accurate motion
* Spirit Level
* Includes 2 add-on weights in addition to the main counterweight