This is a super good price, considering the GTK-XB5 was on sale for $189 in Sep at JB Hi-Fi. This is a much larger and powerful version. Buy 2 and use them as huge stereo party speakers. Just note that they do not have built-in rechargeable batteries so need to be plugged into the mains.
This is a much better deal than the Aiwa speaker I posted yesterday https://www.ozbargain.com.au/node/417175