The battle for the billions of dollars spent at Australian supermarkets every month has intensified today with the launch of another dedicated online grocery store by the nation's largest daily deal website.

Groceryrun.com.au, an offshoot of CatchoftheDay.com.au, offers up to 200 discounted products from well-known brands and charges a flat shipping fee for deliveries anywhere in Australia. But it comes with a few catches. There will be no perishable items. The products won't always be the same and might not be available from one week to the next, and nor will customers be able to shop whenever the need arises. The deals will only be able available on Wednesdays and Thursdays.