Comic books are released with cover dates that are months in advance. For example, last week I picked up Mighty Avengers #20, dated February 2009. This was the case even back in the days of the Original Collection. Case in point: the February 1985 issue of Fantastic Four (#275, my all-time favorite) contains a holiday festive subscription solicitation because it would have been at my corner convenience store in December 1984.
The deal here is less robust than others I've highlighted. Here we are only offered a baker's dozen for the discounted price of admission, but they do try to work the gift-giving angle with the postscript by telling us to "Give Marvel comics as a gift." The available title list reveals this was really in my heyday of comic book reading: Alpha Flight, Amazing Spider-Man, Avengers, G.I. Joe, Marvel Team-Up, The Thing, X-Men.
This is another one of those ads that has stuck with me over the years. I remember wondering why Iron Man's Santa getup was obviously made of metal... rivets and all! I think it's great that whoever drew it took the time to include joint-like details at the elbows, shoulders, and along the lapel so that Santa Shellhead could enjoy some flexibility in the jacket. I do wonder who is under that armor, though. After all, in his own title at this time (Iron Man #191, February 1985), James "Rhodey" Rhodes was sporting the iron hardware and Tony Stark had just recreated his original Iron Man suit. Regardless of who's under that mask, though, it's still a pretty memorable ad.