Recently, YAMAHA has opened up their English version of the VOCALOID shop. Now you no longer need to rely on translation or navigating a Japanese website. Unfortunately, there is not much on offer at the moment. The only products you can purchase are the VOCALOID 4 Editor, VOCALOID 4 Editor for Cubase, and CYBER DIVA for 10,000 JPY ($90 USD) each.
Do not worry however, for they have mentioned that more products will be added.
And please don’t worry. We are preparing to add other voice bank products to the shop. pic.twitter.com/WwK91iMnh5
— ボーカロイド (@vocaloid_yamaha) April 21, 2016
Lastly, they have also posted a short video on their YouTube channel explaining things a bit.