Like I said in my previous post, they are very very readily available...they breed in the coastal waters in southern california...and like it has been previously mentioned, they are illegal.
Rest assured however, it is not a matter of "if available"....they are very readily available and it is very unfortunate but many many many local fish stores in Los Angeles will sell you one for $100.
Cant say anything out of the state of california cause I dont know anybody that would risk bringing one from cali, however, these sharks should not be kept by anyone in this hobby. There is a reason it is illegal. Min length requirement is 36 inches...but it doesnt mean that people dont catch them and sell them in the aftermarket. Its quite sad actually, people need to get in the habit of leaving these sharks alone. I catch them everytime I go fishing, and throw them back. Last night I caught 9 of them, about 12 inches long...tossed them all back. However, as long as there is a demand for these sharks in the hobby, people will break the law and sell you one. No problem.
So to go back to the original question, yes, in LA there are many places you can get them from, practically any fish store actually, you just have to ask for it, and they are extremely illegal.
please look for another more suitable shark to keep.