Masters is opening a new store in Hoxton Park, NSW (south western side of Sydney) this weekend. I got an email about it and it says if you sign up as a Trade Member you get a free cooler bag.
From my experience you need an ABN to sign up, but they don't really check if it's valid. And you need to specify a trade (if you can plug in a USB cable say you're an electrician)
Store details (address, opening hours): https://www.masters.com.au/Stores/NSW-Hoxton-Park-OPENING-MA…
"Come say Hi! to out Trade Team.."
Nice little typo in their ad :)