Where can i find Kairi's necklace(from the kingdom hearts video games) online for less than 50 dollars?

ok for christmas my girl friend is getting me Sora's necklace (the crown) and i thought i would get her kairi's. i would like a website that sells them and is garenteed to have one. i dont want anything that someone homemade. and please no answers like"google it" or anyother surch engine. or " i dont know but i would like to know myself" thank u all