It depends where you receive the items, or how many to buy at once but you might consider to compare. It's the balance of shipping cost! Here some maybe attractive prices of Hatsune Miku figures on Amzon Japan which are shipping overseas.
If you are new to Amazon Japan, this may help you how to register Amazon Japan.
To help you to buy stuff direct from Japan through Japan's largest and well known online shop Rakuten and amazon.jp