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I believe it's a Port Jackson's shark. Similar to the Horn Sharks from CA but these are from Australia.
You can see some vids and info here: Port Jackson Shark
Depending on where you are in the world, this may be an expensive shark to import. For us here in the U.S., the Horn Shark might be an acceptable substitute. I know we used get Horn Shark Eggs and hatched them out. Kind of exciting when you look at that egg case in an empty tank for a while then BAM!!! a little shark appears. (I'm not sure if shark eggs are still legal to collect tho )
FYI: You do need to be careful with what you mix with these types of sharks. Since they are not constant swimmers, they can get nipped on by grazing fish types.
Understood. The only thing then that you should consider is how long the shark needs to be in transit from Australia. Having imported Pacific sharks for a Bahamian company, I know that they don;t always ship well for long distances. If you can get one locally to you, all the better. They are a great shark.