Been buying this regularly from Amazon for $24 a can. Not sure why the massive discount. Could be short dated I guess. Stage 3 is $8.40 a can as well.
Edit: They are price matching Big W it seems. Thanks goes to JoshJ.
Edit 2: Stage 3 back to $28. Stage two still $9 for now.
Edit 3: They seem to be changing the price of this back to $9 regularly. Best to put an alert on the camels to get the best price.