I've only just learned that Amber is signing 2014 Buffy calendars today at Dark Delicacies bookshop in Burbank CA between 2 and 3 pm. Because this news is so late an acquaintance who runs the AmberBenson.tv site has been in contact with Dark Delicacies and they may be able to send you one if you order now. There's more info at the link below.
http://www.amberbenson.tv/latest-amber-news.html