It depends. 9mm and .223 can be kind of scammy, and some vendors list really low prices and charge insane shipping. You need to look at the numbers in the shipping column, higher is better. Or just post around with listings until you find what you're after.

Here's one of the cheaper brand name, new, brass options: https://www.gmansportingarms.com/product/sellier-bellot-sb9a-handgun-9mm-luger-115-gr-full-metal-jacket-fmj-50-bx-20-cs

Adding 20 boxes to my cart works out to about $280 shipped, or $14/box. Buying 5 works out to $80 shipped, or $16/box. I don't know about where you are, but I haven't seen brand name brass for anything close to $16/box after tax in a long time.