UPDATE: Amiami and HLJ have both sold out of the Luka Plush but PlayAsia still has her! PlayAsia also has the HMO Miku.
Yes, I know this is late but by the time I realized that HMO Miku was released it was already sold out! However, today I saw that HLJ and PlayAsia still has some in stock! Also, Amiami/HLJ PlayAsia still have Luka Plushes! If you need some convincing if you should get either of these follow the jump for pictures!
HMO Miku must have been one of the most anticipated Nendoroids because she sold out so fast! Also, the Luka Plush was restocked (at Amiami)! There are only 3 available at Amiami but plenty at HLJ, the drawback being HLJ is 500JPY (~6USD) more expensive; so if you missed out and wanted one go quick! The plush is now unavailable at the previously mentioned sites but she is available at PlayAsia, although a bit pricey.
Below is the price listing of each item and links!
HMO Miku:
Luka Plush:
Now, for pictures of HMO Miku~
Pictures from Mikatan.