No one, and I mean no one, is going to be selling Scalloped Hammerheads to the public. If you know someone who says he has one, he's lying. If you think you have the resources for one, you're wrong. If you think you should get one, think again, because you're wrong.
The best thing that could happen to an animal like a Hammerhead Shark would be to be taken off the free market.
That's a fact.
I hope this is a troll post. If so, disregard everything I just said and go for it, dude.
If you're for serious, you need to do a lot of research. I'm talking, research until you realize that you have a terrible idea.