Sony SRSXB12B Portable Water Proof Wireless Speaker $63 (Normally $79) @ Officeworks
Grabbed one of these last week and was very happy with the price and the sound from such a little speaker.
Normal price is $79, currently at JB for $69 - Maybe they can price match for cheaper?
This is the new model replacing the XB10, the XB12 is now fully water proof and submersible which is cool
More colours available: Officeworks Link
Compact Bluetooth speaker with Extra Bass technology
Water and dust resistant (IP67*)
Music playback controls and speaker-phone function
Up to 16 hours battery life
Pair 2 speakers together for stereo sound, using the Speaker Add function
*IP67/ dust and water-resistant (‘Dust tight’ + 1m/30 mins submersion)
A quick review of the speaker including water submersion test: