Edit: I bought one off Ebay, but if you are looking for a pink controller post here:
People offering to help/general advice for finding one:
Lovepig78 said his gamecrazy might have some. PM if interested (if he doesn’t mind)
Al the Great mentioned Toys R Us was clearancing the Pink controllers out a few months ago and suggests calling your locals stores to see if they still have any before they zero them out of the system altogether.
Luckyday said his gamestop might have some. PM for him to look into it (if he doesn’t mind)