Found outside Harris Farm Leichhardt today, not sure if available in other stores, but there was loads of stock (no pun intended). Advertised as 3 for $5 but in reality, it's just $1.66 each for as many as you like.
Currently advertised at $2.49 on their website.
These are frequently half price at Colesworths, but I've never seen them under $2 in recent years.
Buying 3 will cost you an extra 2 cents lol