Reloading plated bullets, instead of jacketed, you could reload a box of 50 for about $6.50 -6.75.
Jacketed bullets would jump the cost up another dollar or so. These prices take for granted that you have a "free" supply of brass.
If you shop, you can find 9mm ammo on sale for around $10 a box.. usually it's more like $12.
I buy most of my 9mm ammo, but I also reload for it, when I'm bored and have the time. Trying to scavenge up all your brass from a day at the range is an exercise in frustration. I usually end up with about 40 out of 50 from a box. I think the others vanish into thin air...