Some of the good deals are (prices are after the code):
Sleeping Dogs = $22.49 – Steamworks
The Storming, Burning, Reflecting, Flaming, Sabotaging Pack = $7.50 – most activate on Origin
Guild Wars 2 = $44.99
Battlefield Bad Company 2 Ultimate Digital Collection = $7.49 – activates on Origin
Street Fighter IV = $7.63
That’s pretty much it for now. Ideally what happens is Amazon puts a game on sale and you can try to stack the code on top. Otherwise 25% off regular price isn’t that great.