Well this is an odd one from Nintendo. The company isn’t selling a Splatoon 2 Switch bundle. But they are selling a Splatoon 2 Switch bundle box for $5 in Japan.
This isn’t some third party store that made these up, it’s Nintendo themselves. They are selling the box for Switch owners who already have a console but want a nicer display box.
It’s available for purchase (Japan only) on Nintendo’s site here. The box retails for 540 Yen, or about 5 bucks.
I’ll bet 5 bucks that these will show up on eBay in the US marked up 500%.