Also 2 more FREE at Amazon US:
Trey of Swords (Witch World (Estcarp Series)) - Andre Norton
Merlin's Mirror - Andre Norton
--According to Premier Digital Publishing's website -
http://www.premierdigitalpublishing.com/dragoncon/, they're posting 2 new titles free per day during Dragon Con (Aug. 31-Sept.3), with 4 showing as free right now on their website (2 from Sept. 1, 2 from Sept. 2). So, there may be 2 more tomorrow - but maybe today was the last set, we'll see.
--Also, on their website it says if you sign up for their newsletter, you'll receive a free ebook. *Update-I see on the first post in this thread there is a link to their website and the mention of signing up for a free ebook*