Well I would get them from small german breeders, which are much cheaper and it doesn't look too good to contact a breeder without any knowledge of that sheep breed
First I would like to say hi and welcome to the forum, it's great to have you along!
I think there is the Valais Blacknose societies, UK and European too, so they may be a good place to start... I must confess I would indeed love a few of my own, but I do hear the meat is very fatty and the wool isn't the best... I would be intrigued to know whether they breed once a year, or twice like Dorset's, or even how big litter sizes are... All the best with them anyway