Got this from the Dolphins' Facebook page.
Basically they need your name and email address. It's legit, unless someone hacked the Dolphins' facebook page.
http://www.facebook.com/#!/MiamiDolphins?ref=ts
EDit: I am going through it now. They have a bunch of photos you can choose from. It's just a 29.95 coupon, so you can apply it to more expensive stuff too.
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I had this picked out.
http://www.replayphotos.com/miamido...store-setup-print/brandon-marshall_277685.cfm