To clarify, I would be sending this to a Tico for his use. The package would weigh less than 1 pound. US Postal Service shipping small packages internationally does not appear to be very expensive. But from what you are saying, once the product arrives in Costa Rica, customs will open the package and examine the contents, then wait for an unspecified amount of time to release. Will my friend then have to pay duty, and what would the duty be? The product itself would cost no more than 40 US dollars.
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