Just a thought but when I had my first business I went to the local art school and spoke to a couple of instructors who happily put this in front of their classes as a project to work on.
I ended up using the logo they created in my business and gave them a $100.00.
For this badge though I would think the bragging rights to having a badge that you designed all over the country on a bunch of Mercedes might be a pretty good incentive. As long as you make it clear that in the end none might be used and that the final decision is up to the members of the forum (good cop, bad cop) then you comeout a winner no matter what.
p.s. I'm in for a couple myself...