Unlimited: Win $10,000 in Qantas International flights @ Webjet
To enter this contest to win $10,000 in international flights with Qantas, you need to enter your details in the form when you click the link. You have to refer at least one friend to enter, but I don't see any reason why you cannot just enter one of your alternate email addresses. But if you refer friends who then go on to buy through the website, I think you get more entries into the competition.
Then you have to send a text message which costs 55c to enter (the only dawback!)