You can't simply go to the My Nintendo Store and buy the Switch 2. To order the Switch 2, you need to log in with an active, paid Nintendo Switch Online account. Once you do that, you can choose either a Switch 2 standalone console or the Mario Kart World bundle and then hit the confirm button to "register your interest" in ordering a Switch 2.

As of June 5, get the Nintendo Switch 2 + Mario Kart World Bundle for $524.99 at Costco. That's a 14% discount. This deal is only available to Costco members. The Nintendo Switch 2 is officially here.