They've been an off and on holy grail. It's a blackwater fish that ships badly. Either they all arrive alive and vibrant, or the whole box is dead. It seems there's no middle ground. So they end up quite expensive.
The Congolese try shipping them young, which radically increases survival rates, but then we don't want to buy them because they just look like young fish. Shipping them alone costs an arm and a leg.
I'd love to get good enough at breeding tetras to try them, but it is a cash outlay for a delicate fish that might not arrive alive. Plus I'm not yet there skills-wise. I'm working on it.
If I ever win a lottery, the fish I'd order in from Cameroon and the two Congos... that one would be high on the list. For now, I leave them in their blackwater creeks. It's a great fish to see. beautiful.