Atelier-Pierrot now ships overseas with an online webshop! They're going through XOJapan, with some other shops I don't know anything about: http://shop.xojapan.jp/
Also, their Japanese online shop was down forever, but it's up now.
EDIT: For some weird reason they're also selling Victorian Maiden stuff under the same shop? I dunno. That's pretty sweet too, I guess?