I use amiami, and they managed to make enough of those append Mikus for it not to have sold out. I would avoid Tamarket, looks pricey.
Miku at amiami. For 2200 yen.
Even with EMS postage (ona a single figma = 1500 yen) you will still get it cheaper than Tamarket.
Then there's also mandarake. Which has a good supply of genuine older figmas.
otherwise its the usual HLJ etc etc Hobbysearch as well.
I just discoveredwhat happend to my Mami order. I was wondering why I hadn't recieved a notification. It got shifted into the order with Drossel. I had to email them and do some major shifting of stuff to combine them more effectively. Especially since some other stuff was early april and had been put in with other april stuff. Crikey!