This is by no means a deal, but if you are hurting for ammo and are willing to shell out some cash, http://www.luckygunner.com/rifle/223-remington-ammo
has PMC in stock. They are a minimum price of .74 each in the 1000 pack, and over $1 each in the 20 pack. I personally have never needed ammo that bad..
.....update--within 10 minutes they have sold 14 boxes of the 20 round and 8 boxes of 1000 at these absurd prices. Prices are never gonna go down with people still buying over $1 a round.