I just got 500 rounds of 9mm plus a free ammo can for $150 (+shipping), which works out to 30 cents/round. I also just picked up 200 rounds of .223 for $100. I'll let you do the math on that one.
50 cents/round for .223 is pretty average around here right now. You can find it a cheaper, but that's all steel case commie ammo and it stinks and smokes to high hell. 30c/rd for 9mm is about as cheap as I've been able to find it online. Buying it in person isn't an option here because there isn't any on the shelves.