To celebrate MAR10 Day, Nintendo announced a 20 dollar discount on several Mario titles at select retailers, namely BestBuy, GameStop, Target, and Walmart. The games mentioned are Mario Odyssey, Mario Kart 8 Deluxe, Mario 3D World + Bowser's Fury, Princess Peach Showtime, and Luigi's Mansion 2 HD, but other games might also be on sale. This offer seems to be mostly aimed at the US and Canada.

Quote From Nintendo

Get in on the MAR10 Day fun and save! From March 9-15, you can head to select retailers to save up to $20* on select games featuring Mario and friends, including Mario Kart™ 8 Deluxe, Super Mario RPG™, Princess Peach™: Showtime!, and more.