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In the US there is a reduced media mail rate for educational materials. Not sure how it would work internationally.

https://about.usps.com/notices/not121/not121_tech.htm

The US used to have "ship mail" options for sending international by boat. Not sure if there was even more discounts for media, and/or if it's still offered.

Another comment mentioned M-bags: https://faq.usps.com/s/article/What-is-M-bag-Service

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