Best way to get email subscribers from competition?

Hi there, I run a large community of around 50,000 facebook users and I'm setting up a portal on my website to run sponsored competitions.

I wish to use these competitions to get the most out of user interaction (emails to add to my aWeber mailing list and social sharing etc) but am unsure about the best practice. I don't really have the money to spend on the Wildfire app etc.

I like the "pay with a like" plugin, I may use this to reveal the entry form. In particular though I'm looking for a useful plugin or method of gaining new subscribers.

I was thinking about just having the mailing list signup as the method of entry but that would mean anybody already signed up wouldn't be able to enter.

Do you have any suggestions?

PS. Love the new site, far more user friendly :slight_smile: