Cheapest I've ever seen at $3.99. Down from $7. Previous deals were $4.99 & $4.49.
Available with $0 Click & Collect, in store or + delivery at Chemist Warehouse.
8 Varieties available at Chemist Warehouse, Amazon has only price matched 1 so far (edit - sold out):
TRESemmé Colour Revitalise Shampoo with Nutri-Oil and Green Tea 900ml $3.99 - Min Order 2 Sold Out
Edit - Kmart have also reduced their 2 in the range:
Kmart - TRESemme 900ml Deep Cleansing Shampoo
Kmart - TRESemme 900ml Colour Vibrance Protection Shampoo
The standard tresemme range is getting an overhaul/facelift.
They range will be this price until stock is mostly cleared.