Using components purchased between 2008 and 2013, I reload 9mm for $2.39 / box of 50. (Commercial cast 122 gr bullets.)
But.... I buy when the price is right. I'm not one of those guys that walks into the gun shop, complains about the price of powder and primers, and pays it anyway. If it's too expensive, I don't buy it. Old canisters of powder with old price tags, long forgotten at the back of the shelf; and primers with the wrong price tag... these are the things I love.
At current ("reasonable") prices, it would be $5.68 per 50.
I don't count brass in either price.
I haven't paid for a single piece of 9mm brass, in my life, and, likely, never will. I pick it up for free in the desert, mountains, and sometimes in the middle of a well-traveled road. I have
given away more 9mm than I will probably ever use in my life.
Even if 9mm brass vanished overnight, I could load and shoot what I have on hand for the rest of my life.