Don’t take these lists as recommendations but here’s some contacts that I’ve used or brought things from.
My favourite place for random feel good presents
Dorset Hens (my new supplier of Mia, Edna and Nessa).
Race Farm Poultry (suppliers of Ginny, Luna and Cho) – no longer in business.
Chalk Hill Poultry (rare breeds farm near me, supplier of Tonks).
Other Chicken/Good Life type blogs