You guys brought up some other types that I have had good luck with. There are some of the Norinco 7.62 X 39 ammo still at the gun shows, the sellers had been wanting $4.50 a box, but I noticed that the price came down quite abit as the Russian Wolf was cheaper. I liked the Norinco ammo in my SKS's, but it does burn sooty. Probably will pick up a few boxes at the next show before it disappears.
C130E...yes, it is strange how S/B does not seem to offer 7.62 X 39 as their other ammo is available. Midsouth shooter supply carries it but it is around $5.00 a box. And they don't have volume (case) discounts on it either. Otherwise, I just don't see it around. So it does seem that they may have stopped selling it here. I bought 300 rounds of S/B at the March gun show, I think the guy was getting rid of it as it was older vintage ammo. So, keeping an eye out at the gun shows does pay off.
I really like the Silver Bear Match effect ammo, there is one guy at the shows who gets it in about half the time. I had shot some South African brass cased stuff 4 years ago that was really good, I don't see that around as well. There is some new ammo called "Cheetah" that is coming out of Zimbabwe, made on Norinco machinery. It is not cheap, and only one store in my area carries it. I Might try a box.