I'm not buying them, although I feel so sorry for those plants and misery of their lives. I have to admit that at first years of my cacti addiction I tended to buy sick plants to cure them, and once I bought cactus with glued flower on too. But I have overcome that kind of behavior. I can not walk around the world and correct bad deeds of all human kind. It is enough to be responsible for myself, for the beginning. ..
Isn't this Mamm. spinos. rubr. ? What do you think? ;)
True... And probably better way is to stop buying those.
But I saw so tempted once! There was thing pretty little Gymno with smaller offshoots. And of nailed flowers on. Poor thing.
It could be. I asked on Cactus forum and got the same answer :) Very long spines comparing to the ones I see online, but it looks like a youngish one.