I have lav pros for saleSwedish flower hens, blue hen of Delaware, and coronation sussex to name a few. Also acording to some the true heritage breeds are very rare. I only know of a few others in the USA with Russian Orloffs too. Lots of rare chickens!
Oh, and Hinkjc's lav orps... I want some of those SOOO bad!
Lots more too, that's just of the top of my head.
Only 13 hens and I'm not sure how many roosters and as of today a few chicks of the Swedish flower hens! I'd call that pretty rare!