Even lower price at Amazon Australia. Competitors (eg Pet Circle and PetStock) sell for around $66 for a 15 kg bag, with possible delivery fee. As part of their new pets range, Bunnings are selling for $60 (adult variety) - https://www.bunnings.com.au/optimum-15kg-chicken-veg-rice-dr…
Perhaps try and price-beat at Bunnings - therefore down to $38.79.
"Our lowest prices policy means that if you find a competitor's lower price (including GST and delivery charges) on the same in-stock item, we'll beat it by 10%. This excludes trade quotes, stock liquidations, commercial quantities, and items sold by other Bunnings Group businesses and Bunnings Marketplace. Our Price Policy also applies online to products sold by Bunnings."
Woof!