We are able to confirm that Wave 1 of the Mario Kart 8 Deluxe – Booster Course Pass is now available on the Nintendo eShop in the United States on our Switch consoles. Nintendo Switch Online + Expansion Pack subscribers are able to download the DLC for free. If not subscribed, the DLC can be had for $24.99 USD on the Switch eShop.
See also: Our guide with the full Wave 1 Course List