It is illegal to sell, own, possess, or even harass any species of sea turtle in the United States. Even if you were able to find a source outside of the US, it would still be illegal to possess it within the US. Besides the legality of it, all sea turtles reach sizes much too large for any home aquarium. In short they would not survive in any home aquarium. While I was a biologist at NJSA, the green sea turtles at the aquarium were constantly being monitored for infiltration of the liver with excess fat. Even in a 750000 gallon tank they still were not getting the most exercice they need. In defense of the aquarium both turtles were brought there as injured young and have remained there as release is not practical.