There are a bunch of brass FMJs that come in right around $10 per 50rds. WWB, Federal Champion/American Eagle, Blazer Brass, Speer Lawman, etc. I'm pretty okay with paying $9-12 for brass-cased 115gr FMJs, and will sometimes pay just a bit more for 124gr. My favorite among the cheapos is the WWB 100rd value packs. It tends to be loaded a little hotter than the rest and they're packed like sardines...thus occupying less space in storage/transport.
The Russian steel-cased stuff can be fine. I don't buy it because I'm happy to spend an extra buck or so per box (that's literally all the difference usually is) on an American made product that tends to be more reliable and healthier for the firearm. But plenty of people have had good enough luck with it.
"The Future is Unwritten"