I'm a little dubious if you'll get this freebie as the site does not seem very professional, but it does list the australian states at the bottom of the drop down menu, if you want to try for the free t-shirt.
The site is not very clear, and some bit of it might refer to this as a contest rather than a freebie, I'm not sure.
Its obvious isn't it..... ! Through Buckscoop Australian consumers can freely share deals, vouchers or promo codes, bargains and freebies they think are worth mentioning. At Buckscoop you're participating in helping others to share in the good deals that you find and of course the share in those others find as well.