The Fig Rig is designed to provide stability while using a handheld camera. It’s somewhat expensive so consider making your own.
The Poor Man’s Steadicam cost the builder $14 to make.
Making a Camcorder Stabilizer with a gimble ( pivot).
The Shock Corridor Stabilizer is one of several DIY projects contained in Killer Camersa Rigs
Do-It-Yourself Video Support Gear makes good use of PVC. The PVC Fig Rig on Flickr shows all the dimensions in mouseover notes.