Free adult and baby merchandise from Insomnia Cookies with code GIMMEGEAR
Select up to 3 of each style and code will make the total cost $0, just pay $4.95 shipping.
As of this post they have 3 shirt styles, leggings, infant onesies and a water bottle.
Edit: You must be a member of their rewards program which is free to join. You also get reward points for buying these (free) items; it's basically spend $100 get a $10 reward.