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Amazon [amazon.com] has Fisher-Price Laugh & Learn Play & Go Keys for $ 4.19. Shipping is free w/ Prime or on $ 35+.

Product Description from Amazon[list][*]Set of play keys with realistic fob to unlock, lock, unlock, lock, and unlock early role play fun[*]Buttons on key fob activate learning songs about counting, car sounds, and a light[*]Includes fob, key with slider activity, chewy key teether, and soft Puppy keychain