Right now they're hard to get because they only had a single production run. US sites still listing it as available are providing misinfo because the US distributor got screwed over by Nintendo, and the deal didn't go through.
I preordered them the day they went up for preorder. I don't know if they're still instock anywhere, but I'm not really willing to hunt one down, sorry. Try Amiami, Hobby Search, HLJ, and Mandarake.
I looked up the figure on the figma website but it said nothing about if it was in stock or not and I looked at the online store and nothing showed up. I also looked at the sites you mentioned and they all said either "out of stock" or they didn't even show upI'm starting to doubt the chances of me seeing this figure available. I'm going to nintendo world in New York this family day weekend and I hope I see it but I don't think I will.