It's going to be very hard to sell this fish here, as most people here have reef tanks and this fish needs a very larger tank Fish Only tank, especially since it's only going to get a lot bigger.
You may want to check with some of the public aquariums, you wouldn't get money for it but you will get a tax deduction. Also check with some LFS that do maintenance business, as they may have some public clients/business with large tank that can accommodate this fish.
Check with Atlantis Aquarium out in Long Island, I doubt you will get money for it, but at 2 Ft (and growing) you are going to have a real hard time finding it a good home.
If you are interested in trying to donate it to an aquarium I can as the person I know over there if they would be interested.