In terms of sales, how popular was Sword Art Online II? A pretty straight forward question, what were the sales and/or projected sales of Sword Art Online season two?  How popular was it compared to season one, which was really popular?
According to NewType, Sword Art Online II Volume I Blu-Ray DVD sales ranks 5th in the charts. Volume II sales are still ongoing. In total and as of this post, the average sales ranks 4th when compared to other anime DVDs/BDs sales with a total of about 20,000 sales.

Source for NewType(bottom middle-column): http://i.imgur.com/Qx6KWY0.jpg

Average Sales: http://www.someanithing.com/1045