It's probably me, but I've seen multiples of these from the basic figure assortment pegwarming everywhere.
Buttercup - the Moomin / Unicorn fusion is either unpopular, over produced or just unlucky to find owners. What do you expect from a lesser established character from the Toy Story-verse?
I've seen multiples of these at ASDA, Toys R Us, and Tescos. I may personally pick one up, especially if these end up reduced in Bargain-bin Pergatory. The Moomin homage is definitley a plus side.
Have a heart, give this Moomincorn a home.