Free delivery at Pets Megastore.
I'll pop this in as a sale. Pets Megastore are offering free shipping on all orders until 28th Feb. At least it'll work to reduce the price of the supplies.
The shipping is auto deducted at the checkout.
I've put an expiry date in of the 28th as the offer ends midnight 27th US / UK time - so you have AU midnight + 15-17 hours.