Mammillaria hahniana seed source

Looking for seed from Mammillaria hahniana superba. Correct me if I am mistaken, but I believe this is the subspecies with the very long hair. Anyone out there who can put me onto a source for this. I already have the woodsii subspecies but would like the extremely hairy type.
Thanks
Lee

Several years ago I sowed M. hahniana from seed obtained from the DeHerdt brothers in Belgium. This is the very hairy type. I do not know if DeHerdt still sells seeds. I think that it is very unlikely that they will have a website.
Mesa Garden (Belen, New Mexico, USA) does list M. hahnian and adds 'long white hairs'.

Wolter ten Hoeve, The Netherlands.