Nope, shops like Challenger wont have it because, like I said, its from a specialist speaker maker.
As far as I know only the SLS shop sells it. Its called City Electronics on the ground floor. Look for Larry and dont worry the guy is nice and professional unlike your typical SLS moron salesman. Paid $369 for it.
I tested several other brands found in SLS including JBL but nothing came close not even the top end JBL model which was more expensive.