I have a tendency to put off my holiday shopping until the last possible minute. Like, today, for example. I have to run out to the post office later today to get some gifts shipped and there are still a few people I haven't even picked up stuff for.
If you're in this boat and still have some games to gather for your loved ones, Amazon does have some great 50% off bargains. Deus Ex: Human Revolution "Augmented Edition" for Xbox 360 is only $30, which ought to make anybody happy on Sunday morning. For the same amount of scratch on the PS3 side, you can grab Ratchet & Clank: All 4 One or LittleBigPlanet 2.
And in the category of, "You Really Have No Excuse Now," Enslaved: Journey to the West is a pitiful $9 on either PS3 or Xbox 360. Buy one for everyone you love, for Christ's sake. It's a great game and I don't know why everyone hasn't played it yet.
There's a lot of other titles at half off (or even cheaper) over on Amazon's sale page. Time's a-wasting.