Through the deal, you can create a card using your own pictures and text. The card will be sent directly to the recipient, but you'll have to pay for the stamp.
There are 1 million being offered, so be sure to get your claim in for a free one. The offer is good until June 17th at the latest.
Since the deal is being run through LivingSocial.com, you'll need to sign up for an account if you don't already have one. That means giving the company your e-mail address.