If one is lucky, some people may pay perhaps $100-$200 but IME it is a strike of luck.
If one cared for where the fish will end up, it'd be best to find the right new keeper and give it away to them.
There is too little info. We don't know the country, the climate, the aquarium trade scene, etc. The above going is true the temperate USA and Canada. In southernmost USA, it is easier to keep such tropical large predators and perhaps better chances to find a buyer.
If in Australia, it'd be $1000+ for instance.