UPDATE - Best Buy listing has been added.
A tipster who wishes to remain anonymous has sent us pictures of this Mario Kart product. We have no idea what it is, and neither does the tipster. They happen to work at a big retailer, and this product showed up the other day.
There's no mention of this product on the retailer's website, or even in internal listings. When scanned into the computer system, it comes up as a preorder bonus, but with a $60 price tag. This might make you think it's a special case for Mario Kart 8 Deluxe. The thing is, when you scan in Mario Kart 8 Deluxe and this product, the two don't cancel each other out. In other words, both products combined ring up for $120 instead of $60.
Anyone out there have another guess as to what this is? It's kind of late for Mario Kart 8 Deluxe to get a preorder bonus! Is this some sort of special holiday offering? If we get any other details, we'll be sure to update this post.