Best Buy will sell you a new Nintendo Switch Poke Ball Plus for just $19.99, thats $10 cheaper than GameStop is pricing pre-owned units.
These add a new level of fun to catching critters in Pokémon: Let’s Go Pikachu! and Pokémon: Let’s Go Eevee! And while it won’t work as a controller for Pokémon Sword and Shield, these (because they are new and unregistered) will unlock the mythical Pokémon Mew in your game.