First, if you haven't heard, Steven Landsburg, the author of The Armchair Economist has a new book out, The Big Questions. (Once I get a chance to read it, I'll review it and maybe add it to the carousel. In the interim, don't wait on me.) He also has an entertaining blog to go with it.
That being said, check out his take on "buy local." At the very least, it should generate some discussion when discussing comparative advantage and gains from trade.
I welcome your thoughts.