I rarely find butter on sale, but like Corrine, when it goes on sale I like to toss a few blocks into the freezer. I think that the longest I've ever had it in there was 5 or 6 months, after which is deforsted and preformed as well as had it just been purchased. (I always wrap it in plastic wrap - over the foil - and then place it into a zip-lock bag before freezing.)