Tariffs on items being brought/donated to an Organization?

We are heading to South America, from January 2010 through the end of April 2010. We will land in Quito, spend 2-weeks there, then head to Banos for 1-month. We are bringing: books, games, craft items, and digital cameras to the Fundacion del Arte Mundo. I was in a conversation with someone today who wondered whether we had considered the possibility of having to pay taxes on these items.

Does anyone know? I don't think the net value of these items will exceed $200. Do we just declare it on the customs form, or can we do something else?

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