You might check out The Shark Aquarium in new Jersey. He has a large selection of predatory fish. If that doesn't work try Predatory Fish.Net and check out their buy/sell board. There seems to be more of that type fish sold their. Good luck.
Last I heard as long as snakeheads where in this country then they can be bought or sold. The only regulation on them that I was last aware of was that they are no longer aloud to be imported into this country. There may have been legislation scince then passed but I havent heard of any.
Patrick if you want to make a long trip there is an LFS in CT that has 2 for sale right now.
Slip when I was at Nuagy Doggy a couple of weeks ago they had 2 forsale. Might be gone now. I know that they are giving the ones at waterbury away. I Know the ones ay waterbury are for adoption I go there ussualy once a week as I only work like 10 min from there.