It's a balmy autumn day in Turramurra, but Tahlia Crewe's bedroom is ''frozen''. With silver sequin pillows, white feather boas, and a large movie poster stuck on a bright blue wall, it's her very own ice castle, just like the one built by Queen Elsa in the Disney film which has set box office records and continues to empty the wallets of parents around the world.

"Let it go, let it go!" the six-year-old sings, as she stretches out her shimmering cape and hugs her younger sister, Mikayla, who is dressed up as Princess Anna. "I love the song, I know all the words. Let it go, let it go!"

In their element: Tahlia Crewe, 6, and her younger sister, Mikayla, 3, are obsessed with the movie and had to make their own costumes. Credit:Tamara Dean

Her mother, Jasmine Crewe, is among the legions of parents scouring toy shops and websites to get their hands on official Frozen merchandise, overwhelmed by their children's fixation on the animated musical.

But many have been left frustrated with the dearth of Frozen products, with retailers reporting shortages within days of the film's release on Boxing Day.