one of the guys at my school actually met the guy on the chair lift that was making them, had a bunch in his pocket, if you see people with them on their stuff just ask them they might have an extra or know who has some.
I know the exact sticker you're talking about almost got some made for a friend of mind, I would just find somebody on NS who does custom stickers/die-cuts and have them do it.
www.newschoolers.com/ns/forums/readthread/thread_id/693782/page/2/
apparently this guy makes some seems pretty inexpensive as well