Seems like a nightmarish situation has occurred not with the APUG Traveling Portfolio, but with the Acutance.com Travelling Exhibition (formerly at f32.net), wherein one participant has gotten stuck with $240 in shipping fees so far and perhaps more to come, so to avoid that circumstance, I've updated the FAQ thusly--
Q: What method of shipping should I use? Should I insure the portfolio?
A: Use a carrier that offers the best compromise between shipping time and cost. It is not necessary to send the portfolio overnight or to use a costly courier or express service.
Do not insure the portfolio or declare a high value for customs when shipping internationally, or the recipient may be assessed a high duty to receive the portfolio, and will justifiably not accept it, and then the carrier may charge you a return shipping fee. This has not happened with the APUG Traveling Portfolio, but it did happen with a similar project on another site.