Cheapest I have seen this. Works alongside the new Pokémon Moon and Sun 3ds games.
Take your Pokémon gaming to the next level with your very own Pokémon Z-Ring, featuring fun lights, sound and vibrating features. With two ways to play you can synchronise the Z-Ring with your video game for a thrilling 4D experience or use to enhance your imaginative role-playing. Compatible with Pokémon Sun and Pokémon Moon on Nintendo 3DS / 2DS (not included) you can feel the power of Z-Moves as you play.
Resembling a different element type each Z-Crystal has its own unique interactive light-up attack icon and attack sound linking to specific Z-Moves. The ring can hold up to six additional Z-Crystals (each sold separately) collect them all and add to your Pokémon gaming experience. Use the Pokémon Z-Ring on its own for imaginative role play and press the button to activate the various colours, lights and vibrations from each Z-Crystal, bringing the Pokémon battle to life. This set includes a Z-Ring, 3 Z-Crystals and a 2” Pikachu figure.