There used to be two hatcheries that sold them. I don't remember the other one now.
I knew a couple people that had gotten them from each. Neither were pleased with them and when I had some I wasn't either. All of us went through the same issue. They were weak and seemed to always have a sort of failure to thrive issue.
That was a while back.
@JacinLarkwell has had some recently and think had same experience.
@Miami Leghorn has also had them and I believe his did well.
Just my opinion but I think the line does have issues. If you like them give them a try though.