Here is an Instructable for a DIY camcorder shoulder mount. The author is in Europe (Germany, maybe?), which means some of the tools and lingo in his how-to need some translation. I'm not sure the Home Depot or Lowe's carries the type of gutter holders that this guy is using, and I'm still trying to figure out what "Replacement sponge from a Plastic smoothener" [sic] is. But resourceful readers will figure out a solution in a jiffy, I'm sure.
By the way, the approximate cost was listed as 12 Euros (about $15). Compare with this one.