Honestly, not at all.. I live in Japan, and I've been searching for two years to no avail.. Hubby and I have looked everywhere, toy/collectible resale shops, donation type stores (and there's not many of those AT ALL, most have disappeared) in several prefectures and cities, you name it..unfortunately no luck whatsoever
He's talked to a few store owners, and many they've said they've heard of them, but never seen them. Also, yes, no fakies here.
From what I've learned by speaking to friends and family here, they weren't very popular at all when they were made, and Japanese culture for the most part is "if you don't want it, toss it". Recycle and resale shops only became popular in recent years, so I think many met an unfortunate fate.. I won't quit my search, but yeah.. so far, nada.