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Shipping options are sometimes pure chaos
(startrek.website)
General rules:
Exceptions may be made at the discretion of the mods.
Postal services have agreements about delivering mail for each other. Some countries mail services, like China for example, heavily subsidize shipping.
It is not China that subsidizes the shipping - we are who does that. Because China is a developing country. And they make sure as hell that it stays that way for exactly such reasons, while also trying to look like a world leading nation.