I bought the yellow box Norinco in cases years ago with 4 norinco SKS rifles. The green box is soft point hunting ammo & I paid $4 a box of 20 years ago for the green box stuff. I havn't bought it lately so I don't know a current price.
The cool thing about the Norinco ammo for me was that all 4 rifles I bought shot exactly to point of aim with either the yellow box or the green box ammo. I bought a sight adjustment tool but I've never had to use it.