Nintendo Switch is still one of the hottest holiday buys for 2017, and Best Buy is shoring up a partnership with Nintendo to cement itself in the mind of consumers as the place to purchase. According to a brand new listing, anyone who grabs Mario Kart 8 Deluxe at a Best Buy will also get the limited edition SteelBook case while supply lasts.This isn't the first time we've heard of this SteelBook -- over a week ago, GoNintendo got a tip from an anonymous tipster showing off the SteelBook as it was received by Best Buy. There was no listing for it at the time, but we now know it is part of this promotional deal.The case was developed by SteelBook manufacturer Scanavo, the company that typically develops some of the AAA SteelBooks you may have in your own collection. This includes SteelBooks from the Mass Effect, Assassin's Creed, and FIFA series.It's unclear if this SteelBook case will be offered outside of this deal -- either in a similar package with other retailers or a standalone item. However, if you haven't grabbed Mario Kart 8 Deluxe yet, it is hard to turn down this deal.Mario Kart 8 Deluxe is the Nintendo Switch remaster of Wii U's Mario Kart 8. DualShockers had the opportunity to review the game, awarding it an 8.0 out of 10 where we noted "Mario Kart 8 Deluxe is undoubtedly the definitive version of the game — maybe even the series." Check out the promotional tweet from Best Buy, below: