I would say they are pretty hard to find. I found them as a pair once at Meijer. I picked them up then. I also traded for an additional R2-B1 a while back. It seems to me I saw them one other time now too, but don't remember. They are a nice pair. While talking about Sidious Holo, they had a bunch at TRU during Christmas when they came out, that was the last I saw of them, that is where I got mine.