the ordering process is done totally through their email customer support. you will have to contact a sales representative through their email address. it is not possible to do it through the site if we are outside japan. email them to enquire on anything that is listed on their site.
i have bought a bass through the webshop though not from the u-box, as have countless others. i emailed them requesting a quote with shipping on several models, including u-box items, though the u-box bass i wanted was sold by the time they replied. so where security etc is concerned, you need not worry too much