I am planning to buy a dynamo light (Busch + Müller Lumotec IQ Cyo Premium Senso Plus LED Front Light - 1752QSNDI) from Bike24 in Germany. I have used them before for parts that are expensive here in Japan and have been quite happy with their prices.
Their shipping and handling is a flat rate, so it would not increase if the order gets bigger. If anyone here is interested in maybe getting some parts for that N+1 project for the spring or an upgrade, let me know and you can piggyback on my order
Since there is no VAT on sales to customers outside the EU, prices for shipping to Japan will be exclusive of the 19% VAT included by default on the website (i.e. when not logged as a non-EU customer). On the other hand you may or may not be charged 8% JP sales tax when the parcel arrives here – I think last time I was not charged it by customs, but your mileage may vary.