Sony GTK-XB60 Bluetooth Wireless Speaker $288 ($499 RRP) @ Harvey Norman

Harvies 1 day Flash sale. Many items discounted. Brought one about a year ago for about $380. Now half price. JBHI have them for $298 so you could get price match if you cant find them at HM. Wouldn't think there is much stock. Available at Springvale, Maribyrnong, Preston, & Nunawading in VIC

Get 2 and link them together for party. Gets up to 8-14 hours as battery inside. These speakers are not small bluetooth speakers.
Features:
Clearaudio+ is able to automatically adjust your sound settings based in the input provide clear and quality sound. You can also increase the bass levels from your GTK-XB60 by pushing the EXTRA BASS button which will reinforce basslines to create a deep, punchy sound.
The Sony GTK-XB60 Extra Bass High Power Home Audio System uses advanced Bluetooth systems to let you enjoy your music wirelessly. Party Chain enables you to connect up to 10 wireless speakers together and have them synched to the same tracks. With LDAC audio technology, the Bluetooth system can transmit high levels of data to give your audio the clarity you can only get from high quality audio files.
The Digital Sound Enhancement Engine of the Sony GTK-XB60 Extra Bass High Power Home Audio System restores the lost high frequency notes to your compressed digital music files, bringing the sound you experience closer to the sound originally recorded.
The Sony GTK-XB60 has a built-in battery that can provide up to 14 hours* of play time so you can take your speaker outside with you away from a mains power source.
You can play music on USB thanks to the Sony GTK-XB60. Plug in your smartphone or tablet and play compatible MP3, WMA, and WAV files so you can keep the party going. An audio input and output are also available to connect an extra speaker and even your television when you want to take your home entertainment to another level.