expired Philips Sonicare Diamondclean Replacement Heads - $29.95 (RRP $39.95) @ David Jones
David Jones has the Sonicare toothbrush heads back (still?) on sale after the recent Easter deal. I purchased some for Click & Collect at Macquarie Centre and it looks like there's stock in plenty of other NSW stores. Pricing appears to be the same in-store as well (assuming you can locate physical stock on shelves). The black 3 pack is the best deal here as the white heads are only available as twin packs for some reason??
Don't forget an additional 6% off via Cashrewards bringing it down to $28.15/pack.
Black 3 pack available here
White 2 pack available here
White compact 2 pack available here