Friday, June 7, 2013
Unfortunately there isn't an easy answer to this. The best place to buy almost any Japanese collectible, including Nyan Nyan Nyanko plushes, is Yahoo! Japan auctions. They have a reasonably good selection of plushes and much lower prices than Western sites. There is also M-bok, another auction site, also with good prices but their selection isn't as good.
To purchase items from Yahoo! Japan auctions requires a shopping service (I like Noppin) which is a business that for a small fee will act as a middleman and help you purchase goods that are only available in Japan. All the steps required can be a little intimidating at first but it really isn't much more difficult than shopping on e-bay.
Speaking of e-bay...they're also a good place to find Nyanko plushes. There are usually only a few Nyan Nyan Nyanko plushes for sale at any given time but if you have patience and check daily you can find some great things. I would put eCrater in the same category as e-bay.
Then there's My Nyanko World. I haven't ordered from them so I can't give any sort of feedback as to what sort of business they are. The prices are high, for sure, but they look like they have a good selection. Anyone bought from them?
As a side note: When looking on Japanese sites for Nyan Nyan Nyanko plushes the search terms you want to use are "にゃんにゃんにゃんこ" (Nyan Nyan Nyanko) and " ぬいぐるみ" (plush).
Hope this helps! Good luck on your hunt for cute kitty plushes!