I think we call those Beer Balls up here. They are about 40 bucks or so and you get about 3 30 packs worth out of them.
Weary, you should get a hand held zip saw, one with the blade that almost looks like a screwdriver bit....they are extremely handy and would carve out a trail sign in no time. Router works too though, just bulky to move around....unless it's mounted to a router table. Which it probably is.