With 20% of Bing Lee you can get the JBL Boombox for $328 saving $72 ($400 Harvey Norman). Pretty sure this is the lowest price it has ever been, bought two thanks OP.
These are the best 'portable' speakers I have used, and at 5% power neighbours are calling me to turn it down. If you have been looking for a good speaker to stunt or for parties this is it.
Just a quick fyi my brandnew boombox from Harvey Norman has a low buzzing sounds audible during low battery life and very low volume. Pretty sure this is an issue so I plan to return it soon :) and get a brand new one. Did research heard this is a common problem but fixed through luck of draw, I'm not sure how easy it is to return to Bing Lee if this occurs.