Like you said it's super potent and no junkie abuses it because well you simply can't. There's quite literally no way someone can take it without fatally overdosing. Therefore, drug dealers don't make it, well some do but they don't really sell it and advertise it as such. They lace other drugs with it such as fentanyl, heroin, meth, and so on. You don't need Nitazene to actually OD. I know Nitazene is like a 1000x more potent than morphine but Fentanyl is close enough. It's roughly 100x more potent than morphine. It's lethal in extremely small amount to those who are naive to opiates. 1-3mg is enough to kill an adult.
If you want info on how to get it I can teach you. I know a market for it and a dealer. I would also appreciate a message if you ever actually do end up getting it. I haven't bought it yet and don't plan to do so until I know that my parents won't mess with it since they don't value privacy. I'm too broke to get a P.O box to deliver there so I'm risking it all by sending it to my home which would be in a couple of weeks or next month not entirely sure.