Seth Larson
LAN Party Calculator for Mario Kart, Kirby Air Ride, and F-Zero
https://sethmlarson.dev/lan-party-calculator-for-mario-kart-kirby-air-riders-and-f-zero
Desmu 
@sethmlarson You can also consider local multiplayer features with Nintendo Classics https://en-americas-support.nintendo.com/app/answers/detail/a_id/41236/~/how-to-start-local-or-online-multiplayer-in-a-nintendo-classics-game .
I don't think it will be cheaper for an individual game but it may be more interesting in some cases. With a Switch 1 and an NSO+ subscription, you can cover seven racing games from four different consoles.
How to Start Local or Online Multiplayer in a Nintendo Classics Game | Nintendo Support
Follow these steps to start a multiplayer game from the Nintendo Entertainment System, Super Nintendo Entertainment System, Game Boy, Nintendo 64, SEGA Genesis, Game Boy Advance, or Nintendo GameCube classic game libraries.
@desmu I hadn't considered this angle, very true! Although I don't think many of these games support multiplayer for more than 4 players, unless I'm mistaken? I would be super excited to see MKDD supporting more than 4 when it comes to NSO+ 👀