Are you a Museum Patron yet? If not, now’s the time to join. Up until August 31, 2013 all new Museum Patrons will receive a coupon for 20% off an AMA Plans Service purchase in addition to receiving the other patron benefits. 
For more information, including how to sign up, check out this post: https://amablog.modelaircraft.org/amamuseum/2013/02/06/new-museum-patron-promotion/