Rachel Grey asks: "I'm getting married in September to a fellow geek (in the MIT chapel, no less), and we're trying to find geeky wedding favors to give at the reception. Ideally these would cost $4 or less and would provide some instant fun for the guests, so that it doesn't matter if they actually take them home. Some good ideas we've had so far are tangrams (available in bulk for a little under $1/set) and micro Hoberman spheres ($4 apiece). Any more ideas?"
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