I saw one lone individual for sale about 8 years ago, it was $300.
And although I've been trying to get them for about 20 years, just buying 1, is not my MO.
I only usually would buy groups with the intent to breed, just buying 1 to me is pointless.
Right around the same time I saw a video of Heiko Bleher collecting them in Iran, but no info after that.
I believe they have kept and spawned by aquarists in Germany