It depends on where you get your bullets and brass. I can essentially pick up off the ground all of the 9mm brass I will ever need for free at the range I use - but I already have plenty. On GunBroker, there are people that will provide brass free if you buy their bullets, plus a lot of sellers offering brass. Missouri Bullets sells cast 9mm bullets for about $50/1000 plus $11.35 shipping, and the shipping will cover 2000 bullets.

Say, lead bullets are 7 cents, primer 4 cents, powder maybe 2 cents, and brass is essentially free or close to it as it is re-useable for many loadings. Not counting amortization of your reloading tools and dies, that's about 13 cents per round, say $7.00 per box of 50. At the gun show last week, due to the current craziness, I saw NO FMJ 9mm ammo on sale for less than $20/box. Draw your own conclusions as to whether reloading is economically worthwhile.