A traditional set of dolls can be very expensive. There are various grades for the sets, and some full sets cost more than a million yen. Unless there is a set handed down from generation to generation, grandparents or parents buy them for a girl by her first Hinamatsuri (hatsu-zekku). However, since many Japanese live in small houses, royal couple version (with only the Emperor and the Empress dolls) is popular nowadays. There is a superstition that if you don't put away the hina-ningyo soon after March 3rd, the daughter will get married late.