I used to use $10 per box of 50rds of brass cased 9mm as my buying point. Here it is for $11 per 50. That's close enough for me.
Sellier & Bellot 9mm Luger 115gr FMJ 50rds SB9A
I especially like the S&B ammo because they pack the ammo in those boxes so closely you can fit more in an ammo can than you could of with other brands.
Free shipping over $100 this weekend