Pacific Hi Fi just announced 9.5% discount to all items storewide from 11/10/2012 to 14/10/2012
Yeah, it's only $10 off but Brainwavz are excellent and a Dual Dynamic earphone under $100 is a bargain in itself.
Cheap headphones, seems to be popular with OzBargainers. Specification page: http://www.koss.com/en/products/headphones/on-ear-headphones/PortaPro__Porta_Pro_On_Ear_Headphone