I ordered some games today that ordinarily cost $65 and $20 and I ended up paying $35.
If you order 2 or more digital download games (I ordered Dragon Age:Origins Digital Deluxe and Red Alert 3 Uprising) you get 40% off. Already a good deal right? But if you also add the promo code "EAPARTNERS2009", you get an ADDITIONAL 30% off.
That's pretty big discount. The 40% off is until 12/24. I don't know about the additional stackable discount. And I don't know if they'll call me on it, but I've already paid so it looks like it'll go through.