Target - Herbal essences shampoo and conditioner buddy pack $4.49
Clairol Herbal Essences shampoo 300ml and conditioner 300ml buddy pack (they are shrink wrapped together).
The normal price for a single is usually around $6 so $4.49 for the double is good.
Target have % off a lot of the haircare/skincare range which is making the buddy packs really good value.
Others I noticed were Pantene buddy pack (750ml each bottle) at around $10.50.
This was at Target Miranda but I assume they're all the same.