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Amazon has the TOMY Pokémon Z-Power Ring Sets marked down.

Newer Black Z-Power Ring [amazon.com] is $ 12.31
Original White Z-Power Ring [amazon.com] is $ 11.70

Per the reviews, the white one seems to be more prone to issues, so I got the black one.

These are good for kid’s roleplaying and they also pair up with the Nintendo 3DS Pokemon Sun and Moon games.