Depends what you mean. You can order them from just about every hatchery, so in that sense they are not rare. But those aren't well bred birds. Well bred ones are harder to find, but you can find hatching eggs for them pretty reliably.
They are on the Livestock Conservancy's watch list, so there is that.
When you have them please post a picture! We got mine at about a year old so I think that is she is a little on the flighty side, butnthey are beautiful chickens and she laid really really well through the winter.