A more sincere answer might be the Hong Kong Market on Rt. 18 in East Brunswick. It has been a long time since I was there but they carried a TON of exotic asian fish and more. That might be your best shot. Good luck and please due tell what you plan on doing with it.
I don't know where you can buy one.....but I'll let you come camp in my yard for a couple days as we get them as visitors every so often from the creek adjacent to my home. Awnry little guys I can tell you that much.