I’m ordering a Gadsden flag today and will use that as my sign at the local April 15 TEA Party.
http://www.flagline.com/id01140130
It doesn’t meet your specs, but IMO it’s one of the most appropriate ‘signs’ a patriot can have. Just my opinion, of course.
I’ll be using a poster of a snake coiled around a map of Michigan with “DON’T TREAD ON ME”.