Dick Smith offers the Sony SRS-X3B Portable Wireless Speaker for $128, down from their normal price of $198. The next best price for this speaker is $248 and this current price is the cheapest price ever offered in NZ according to PriceSpy.
This wireless speak has been rated 4/5 stars on Cnet and 81/100 on Engadget. It appears to be available at many stores for Click & Collect if you want to save on the delivery fee.
2ch speaker system with dual passive radiators
Maximum output power: 20W (10W+10W)
Bluetooth with NFC One Touch Connection
Hands-free calling function
ClearAudio+ for high quality, clear & realistic sound
Sound Mode for wider sound stage
Micro USB charging
Built-in rechargeable battery (approx. 7 hours)
Stack with this just launched promo once they fix it:
https://www.choicecheapies.co.nz/node/1760