The Warehouse offers Finish Dishwasher Tabs All in One Powerball Regular 56 Pack for $10, down from the normal price of $18. This is the current best price on the market.
Click and collect in store for free.
Other retailers:
Mitre 10 $29
Expired deals:
Treatme 114 for $29 So $14.50 for ~57
Grabone 110 for $37 So $18.50 for 55