https://www.petbarn.com.au/dogs/brand/ivory-coat
I was looking for a change for my bullmastiff switching from black hawk and found these.
18 Kg bags for $89. Comes in at just under $5/kilo
If price in store are RRP, Let them know the website pricing on your phone and they'll change it at checkout.
Should be able to stack with the coupon "FREESDD" to get it for $79.05 :)