barnes and noble educators' discount

Barnes and Noble is offering a 25% discount to educators this week in New York. I am hoping the discount is a nationwide one, too. What B&N requires to prove you are an educator (I've been told by a B & N staffer) to get their "educator discount card"- is a letter from your Board of Education liaison stating that you are homeschooling, or some other "official proof" that you are a homeschooling educator.