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Shipping costs for Japan are 400 yen (≃ $ 3.70) (Letter pack with tracking number).
International delivery costs are 720 yen (≃ $ 6.80) (airmail with tracking number, delivery in about 2 weeks). In case you order a bag, + 230 yen will be added to the shipping costs.
Shipping costs are regardless of the number of products you order, so it’s better to group your items in one order!