I wouldn't give you much hope - they're the sort of thing that are very important from an historical breeding POV but I suspect there's very little being grown commercially - except perhaps on a smallscale farm in Russia somewhere? ISTR reading a nice article about them somewhere, can't find it now.
You don't say what country you're in, but in parts of North America you may be able to buy rhizomes, eg here :
https://sandyridgefarmsinc.com/product/uk-serebrianka/
but I'm not aware of anyone selling rhizomes or hops in the UK.
Beer like a Chav’s kitchen!Black Tea and Tobacco... that I like.
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