Square Enix hasn't really done anything sale-wise since they started releasing games onto Android but that appears to have changed as a bunch of their games are now on sale for the holidays. This isn't just a dollar or two off of their game's regular pricing either but a heavy discount on most of their titles.
We won't sugar coat anything and instead here is the list of games on sale right now:
The only game that isn't discounted is their Final Fantasy III game for some reason. If you haven't picked up any of the Square Enix games because of the pricing they are usually at, now is an excellent time to go get the titles you've wanted to get. The sale ends on January 3rd, 2013 so you do have a bit of time to pick up the games you want.