Looks like you and I are hunting for the same sorts of things, based on your other search for the Mickey/Minnie plush sets!
As far as the charm, I have also been looking for that thing for about 4 years now with no luck, even while having it in my search lists on several auction sites for just as long! The only time I have seen that charm was when it came up for sale two months ago on eBay and it was attached to a sterling silver bracelet with about 8-10 other sterling charms, none of which were Disney. If I remember correctly, the asking price was around $200 for the bracelet and charms, and I offered to buy just the 2011 charm from the seller for $15. He was not interested in removing any of the charms and selling them individually because he felt "the whole was greater than the sum of it's parts", as he put it. I did not see the logic in this because the other charms were sterling, were NOT Disney, nor did they have anything to do with Disney. Clearly, he and I had two vastly different ideas as to what makes a good sale!
So it remains one very elusive Disney charm, and apparently along with '09 and '10, as I have managed to hunt down '08, '12, '13, '14, '15, '16 and '17 quite easily.
So I wish you the best of luck in your search, and if you happen to run across two, let me know.