Hello! Welcome.
This fish, Belonesox belizanus?
Wetspot possibly at some point in time.
https://www.wetspottropicalfish.com/current-stock/
Aquabid
Local Aquarium club /society members
If no luck perhaps an email to Greg Sage he is familiar with many fish, could direct you.
Greg Sage- Owner of Select Aquatics
selectaquatics@gmail.com