Depends on how many are given out, if they can be eaten/gotten rid of, and how long you wait. Last years didn't go up much, but I suspect they probably will more next year. 2 Years is usually about the turn about, although they still don't go up that much. If it can be eaten, it'll usually go up more, and things like the Christmas boxes where you don't really know what's in it will make it go up more too. Just stick things in your SDB, and trust me, you'll probably forget about them and when you remember you'll have free money!