We slowly weaned her off of it, and only gave it to her at nap times and at bed time. Once she started napping without needing it, we gave it up at bed time too, and only gave it to her if she started getting mad. It was an easy transition.
Since I'm under the impression you don't have much time, my brother-in-law told me that with their kids, they cut the nipple part of the pacifier, said "oops, it's broken," and then they didn't want them anymore.