Their demand must've skyrocketed then. I looked through older MM listings going back to around 2018 and prices were in the $400, $300, even mid $200 range and most if not all of them appeared to be captive bred.
I looked on Fauna Classifieds and it seems to be a similar story, though I see listings even a year ago that were cheaper in similar ranges as above, but recent posts from this very month seem to be $450 minimum. Strange...