Bose SLWMII SoundLink® Wireless Bluetooth Mobile Speaker - $336 (free shipping) Videopro ($399 RRP) - pick up in store if available or shipped. This is the second generation version.
For $407, you can get the same one with a leather cover - http://www.videopro.com.au/p-6074-bose-slwmlxii-soundlink-wi…
One of the better bluetooth portable speakers on the market at the moment and is well up there with the Jawbone Jambox etc.
I know david jones are selling them for $399. They are also still selling the first generation version for $449 (http://shop.davidjones.com.au/djs/en/davidjones/home-leisure…) and for $499 with leather cover (http://shop.davidjones.com.au/djs/en/davidjones/home-leisure…).
I wouldn't call this 'cheap' for bluetooth speakers generally speaking, but if your in the market for this particular model than i think this is a pretty good price :)
these would go well with my Dr Dre headphones and Monster cables………