There is another type of camera stabilizer that is popular called a fig rig. It is named after director Mike Figgis who invented it. I think the base price for them is cheaper than a steadi-cam or glidecam.
I have shot with a glide cam in the past. I don’t think the are particularly heavy for a camera stabilization rig, but to my knowledge none of the handheld rigs are designed for long periods of use. Even the body mounted ones are only intended for short periods of shooting. They make a couple of attachments for it like an arm and shoulder brace to make it easier to use for extended periods of time. The advantage of the glide cam over some of the cheaper models is that it uses a gimbal and counter weight system. If you really want to save money you can always build your own rig, there are several designs online such as: http://steadycam.org/
