Frendlies Chemist Brookfield Place in Perth is currently displaying a sign that reads:
SALE
3 for 2
Buy 3 products of the same brand and receive the cheapest item free
Available on selected brands only
No further dicounts Limited time only
Don't have any further details I'm afraid, just snapped the picture running past. Not sure if this is available at any other Friendlies stores, what the brands involved are and how long this will be running for. Will find out later and update.