This is rather curious. In doing some comparisons between various sites, I found that Voices of Dragons, by Carrie Vaughn, is one of the book covered by the agency pricing. However, on the Kobo site:
http://kobobooks.com/ebook/Voices-Of...ZvA/page1.html
Does this mean that Kobo (and maybe Sony by implication) are "cheating" the publisher rules by having them still on their sites AND having it discounted?