Triakis Scyllium or Banded Houndshark is sometimes sold as Japanese Houndshark or Japanese Leopard Shark.
Which makes some sense - when you think about that this species is a cousin of the California Leopard Shark, and that it's native to Japan. However to usually get this species you will need to find a dealer that imports live sharks from Japan, or Asia.
As for the Chain Catshark - this species is native to North American waters (namely the Atlantic Coast) and can grow to 19-24 inches (depending on the sub-species). It is possible to find captive born juveniles for sale for about $500 each.