Some of the noteworthy offers, just from a quick overview, include $14 Dead Island ($10 on PC); $10 each for a bunch of standout DS games like Chrono Trigger DS, Exit, Final Fantasy: The 4 Heroes of Light, and both Space Invaders Extremes; Nier for $10; and more. Even DLC is on sale. Basically, if it's from Square Enix and from this generation, it's on sale.
Even iOS release Demons' Score is discounted, in its own offer. Through January 31, it's just 99 cents (down from $7), and the many, many in-app purchases are all cheaper.