EDIT: Well that was a classic case of being Hiffed.
We've posted Luna freebies in the past and all of them required you to join their newsletter. We also tell new Hiffers to make a freebie-only email address. Well if you've ever signed up for a past Luna offer, now's the time to log into your email and look around for a free Luna bar link. The subject should be “A Holiday Gift For You From LUNA.”
If you've never signed up for a Luna offer in the past, then you can't get this freebie. However you can join their newsletter to qualify for any future giveaways. You can also join HIF's newsletter to qualify for being awesome.