Cabelas has UMC for less than .50 cents per round. It's not an awesome deal, but it's brass cased ammo for a semi-decent price. They're backordered right now, but only 3-4 weeks out. That's not too bad. Good if you have a month's supply in the safe already!
Also, they have steel cased 7.62x39 (Herters) for about .33 cents per round. In stock.
EDIT: Forgot to add that Cabelas is pretty good about backordered items. In 2009, when everything was crazy the last time, they took 2 extra weeks to get one order to me. Not bad considering that was a decent price and everyone else backordered for months out.