Yes, Germany. I checked quite some places around. One dealer in a small town (who even got APS-film) told me he would never order Instax film as he would not sell a single pack.
Online sellers can only be taken into account for availability, but not for spreading the news. People (and I am not speaking of young folk surfing all day for new things) who do not see an instant camera locally, would not start looking for it on the net.
You are right, Germany is still in a very good position concerning local film availability in general even in small places. It is getting worse here too though.
But I have never ever seen anybody with an Instax camera. Actually I only once saw anybody with a film camera at all this year.
An experience which has to be taken into account to make the picture.