disney ily 18" dolls

i'm in the minority of people who really love the disney ily 18" dolls. i think they're so precious and i definitely waited too long to get one because all the ones i want are no longer being sold at target.

i was wondering if anyone knew why the first line of dolls are so hard to obtain now? there's definitely people with more knowledge on the history of these dolls than me and i'd totally love to hear any of the history that people know!