From 3/21 to 3/30, the Square-Enix Store will be holding a sale which has saving of 20% off with the purchase of one game. 30% off with two and 50% off with three.
Most of their games are covered in this with the exception of pre-orders, DLC or new releases. CDs and other merchandise are not part of this sale either.
This is happening for one week so you may want to hop on over to the Square-Enix store and grab yourself some games.