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I considered several commercial options -- from $69 to $600, and more. Then I bought this one for $69 and modified it. ... a simple PVC pipe arrangement in a Y shape (see photos) -- called a SpiderBrace at http://www.spiderbrace.com/. Frankly, it's totally useless for my purposes, since it had no counter-balance, and the camera is front-heavy. I added the 2.5 lb weight at the back (right), and the stick which clipped to the belt for added support.
Ultimately, I trashed the whole thing, and went to steadytracker.com --- and bought their 'extreme' version for $350. So far so good ... great shots in motion while walking, running, spinning and dutch angles. Only problem is the weight on my weaking wrists.