I've had luck finding hard to find dolls on Mandarake Japan. Try searching for the term Pullip and you'll get pages & pages of dolls! It can be tricky to narrow your search down because sometimes the doll name will only be in Japanese but you can just browse all the Pullips.
[link removed ~ hathorcat]Keep checking back if you can't find her there now because they are always adding new stuff. Good luck with your search, Akemi is lovely