Nintendo is reportedly releasing a physical alternative for the DLC of Mario Kart 8 Deluxe in Japan. The Japanese release will include the base game and the Booster Course Pass, which consists of Waves 1-5, all on a single game card. The only additional download required will be for Wave 6, to be released in Winter 2023.
On the other hand, the physical deal available in the West, at least in certain regions, only includes a DLC download code, without the base game or Switch game card. However, this version does come with extra bonuses such as a sticker sheet and pins.
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There have been no further updates or announcements regarding this alternative DLC physical release. It remains to be seen if players will choose to purchase these physical deals for the Mario Kart 8 Deluxe DLC.
Source: Nintendo Life