I have an army of a pony that I would say is more desired, but I certainly wouldn't say he's hard to find (I see him for sale aaalllll the time. I don't buy him very often.)
HOT DANG! Now that is an army of a hard-to-find pony!! Or at least for me, I never see any of the Big Brothers
There are several Barnacles on ebay as we speak - both alone and in lots. And he comes up for sale on the arena plenty. And every pony meet or convention I've gone to there are tons of people selling big brothers. I really don't consider Barnacle to be a hard to find pony. Maybe a "I don't want to pay that silly ebay price" pony, but he comes up for reasonable prices with good regularity. Not like some other ponies on my wishlist who I've been hunting for for years.