You can get Super Mario Odyssey for free when you buy a Switch Pro controller - The Verge

For $70, you can get the Switch Pro controller, and with it, a complimentary download for Super Mario Odyssey for the Nintendo Switch. Normally $60 by itself, this bundle is a fantastic deal for new and current Switch owners.

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Nintendo Switch Pro Controller with Super Mario Odyssey (English)

Function defines form. Pro-level back buttons. Pro 2 features two Pro-level back buttons. These buttons give you more control so you don't have to take your thumbs off the thumbsticks. With 8BitDo Ultimate Software you can assign any button function and macros, too. More ways to play. Custom Profile Switching. Enhanced grip. 4-way Mode Switching button. Pro 2 gives you more ways to play. The custom profile switch button holds 3 custom profiles that can be switched on the fly.

8Bitdo Pro 2 Bluetooth Gamepad (Black Edition)

Nintendo Switch Pro Controller with Super Mario Odyssey Full Game Download Code : Video Games