This $24 dollar shoulder rig just won't quit. Well, we may have to change the name as the popularity of this cheap plastic design gains popularity, the price has since inflated. This unit also is being sold under different names, but I have never heard of any one designed better than the other. There's an adapter that allows for an offset, I don't suggest loading that up as it's not designed well, but the base shoulder support works great. I posted several articles about this thing over the year, and there's been several others enhancing the use of this cheap support. Here's a recent look at how Vimeo member IE DNLab used it as additional support for the Steadicam Merlin DSLR Stabilizer.
Limited in range unless you feel like squatting for every low shot, but using it for something like this will definitely provide you with longer shooting times while you save up for your vest. Prices have inflated elsewhere, but right now you can find it cheaper than $24 dollars over at Amazon. As always prices subject to change normally after being posted here. LOL. If you're interested in something I did with my cheap shoulder mount, check out this video http://cheesycam.com/a-s-s-implants-how-to/
But if you're looking to step up your dollars a little bit, the Gliders Shoulder Support has the same functionality, with a bit more quality in parts.
Gliders Shoulder Adjustable Support Camera Mount