Vivinavi

Shipping to Japan

I'm buying high brand items from Hawaii to Japan
？
My family asked me to buy high brand items
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I'm not sure which shipping method is best and what about customs duty I've been looking into it and can't seem to find anything. I don't know which shipping method is better and what about customs duties.
If you know anything about it, or if you ship often, could you please let me know ？ I'm also thinking of a gratuity.
Thank you very much.