http://www.microcenter.com/
You wont see it on their website but in store they are advertising an instant 10 dollar savings. (I saw this in New York)
I believe it's for people who pre-order it only tho. Best offer I found so far.
Looking for any and all Diablo III deals (regular edition)
I already own a CE of Diablo III but want to find a good deal for a basic edition. I tried searching the forums but found nothing but expired offers.