How To Buy The Animal Crossing Switch Parts Separately, From Japan kotaku.com

Many of the millions of people who already own a Switch are tempted to upgrade just for the new look, but wish they could just buy the accessories separately.
Well, you can—from Nintendo’s Japanese store.
So if you want to buy them individually, the Japanese store might end up being the only way to do that.
There are many, many different services out there that will buy Japanese goods for you and ship them anywhere in the world.
(The Nintendo store offers free domestic shipping if the item is over 5,500 yen, and both of these items are.