Update: Looks like they charge $9.95 shipping
This one you need to refer friends to, but it is pretty easy!
Get a free Mirenesse Supreme 24hr Secret Weapon Mascara. Visit this link and sign up. Once you do that you will get your link to share with your friends.
Once you get 5 friends to sign up you will be emailed a code to redeem for your free supreme mascara.
This may not work via mobile.