Check your local Facebook "Buy Nothing" group. People give away old Switch cartridges surprisingly often when they finish the game. Happy brawling, and remember: no items, Final Destination, free only.
Similarly, while Redbox has largely disappeared, independent video rental stores (like Family Video remnants or local game shops with rental programs) often offer a "first rental free" coupon for new members.
If you want a permanent free experience, Brawlhalla and Multiversus are waiting. But if you want the real Nintendo magic—the pause screen of Mario punching Pikachu while Sephiroth charges in the background—your best bet is to make a friend at the library.
