This site has instructions how to build a Steady-cam for just $14.



For those who don't know what a steadycam is I'll quote from the site:


Steadycams are attachments used to capture smooth looking video even when the camera and camera operator are in motion. The camera operator may walk (or even jog), move through tight hallways and doorways, and even climb up and down stairs without shaking the camera. Unfortunately, professional steadycams cost around $1500. Even the cheap 3rd party ones cost $600+.