Black Hawk Dog Adult Lamb & Rice 10kg - $24.99 (Was $54.99). Delivery is $9.90 flat rate, eg 4 bags/40kg is $109.86 delivered = $27.46 per 10kg bag.
Further 8% cashback with Cashrewards as well.
Thanks to Price Hipster for the deal.
Edit: It may be a price error or clearance stock with a potentially shorter than normal use by date, buyer beware.
Edit 2: See comment not a price error, but currently on backorder according to staff member.
Price error? That's very cheap