OMO Ultimate Laundry Detergent Washing Powder 5kg $39.84 + Delivery ($33.86 Delivered with OnePass) @ Catch

Beats Colesworth’s $40/5kg (if you can find it) if you have OnePass, otherwise you’ll be losing on shipping. Good detergent, but the real OzBargain tip is to buy Aldi’s brand and just use the OMO product for whites/dirty stuff.