It's been confirmed now that there is definitely a significant stock shortage of Animal Crossing amiibo Cards for the Japanese launch, but more are on the way soon. (animalcrossingworld.com)
It suffered a little bit from stock shortages during the first few months, but this issue has become smaller and smaller in recent times. (nintendoenthusiast.com)
The Switch is looking more like a runaway success, plagued by stock shortages from overwhelming demand. (techtimes.com)