UPDATE - If you phone Officeworks (don't go in-store) on 1300 OFFICE (633 423) for their Price Match against the Boombeats website, you can get a pair for $284.04 delivered
Boombeats website - http://www.boombeats.com.au/bose-quietcomfort-25-qc25-samsun…
Thanks for Jinx for alerting me below and Porthos for sharing a copy of his receipt and mentioning it here https://www.ozbargain.com.au/node/218848?page=1#comment-3184…
Copy of receipt - http://files.ozbargain.com.au/upload/61450/34732/officeworks…
Bose QC25 noise cancelling headphones are on sale at Sydney Hifi (Authorised Bose reseller/dealer). Black are selling for $338 and white $348 delivered, both normally $399. Head to Officeworks to get them even cheaper.
Android
Bose QC25 (Black) $338 - https://sydneyhificastlehill.com.au/shop/headphones/bose-qc2…
Bose QC25 (White) $348 - https://sydneyhificastlehill.com.au/shop/headphones/bose-qc2…
iPhone
Bose QC25 (Black) $338 - https://sydneyhificastlehill.com.au/shop/headphones/bose-qc2…
Bose QC25 (White) $348 - https://sydneyhificastlehill.com.au/shop/headphones/bose-qc2…
I've been looking for a pair of QC 25's and the cheapest I can find is trying to price match http://www.boombeats.com.au/bose-quietcomfort-25-qc25-samsun… with Officeworks for $284 delivered. You have to call Officeworks to get the deal though, can't get it in store.