Pretty much anything GreenFire has or had is available. The more people breeding those breeds the lower in cost they get. There was recently someone on our state thread trying to get rid of a young breeding trio of Marsh Daisy's for $60 on Craig's List, no takers. I told him he was messing up, should've explained how rare they were and asked for a couple hundred $, might have sold them IDK, Lol!
Pretty much any of the many breeds we have had here in the US is still available from hatcheries, and some much better quality from breeders.
Sand Hill Preservation Center has quite a few rare breeds also, I had a Manx Rumpy and a bunch of Red Sussex for packing peanuts when I ordered my white Jersey Giants from them.
I was looking forward to keeping the Sussex, I know of only one other place that has the red variety and these were beautiful. They grew fast, but didn't get very meaty, lay great, but small eggs...So I ate the two roosters and the hens will go sometime.
Giving the naked necks a try now, heard nothing but good stuff on them.
I didn't know about marsh daisys, so I googled them. They are beautiful chickens!