Just bought the very popular Bose QC35 headset for $399 at Myer - Macquarie Centre, NSW. Big sign over the electronics department "20% Off the original price of TV's, headphones, speakers, home theater, cameras and camcorders. (Excludes clearance & Go Pro, some items previously discounted cannot be used with other offers. Offer ends Sunday, 3 July 2016. Not all brands , styles & colours available all stores".
It's unclear at this time if this promotion is at Macquarie Centre NSW only or nationwide. It would appear that other stores have stated that Bose are excluded from the 20% off, see comments for more details. There is no requirement for another store to match the deal & Macquarie Centre may rectify this also.