Surplus 7.62x39 is in abundance elsewhere. I can choose between corrosive and non-corrosive primed; China, Russia, Czech. Used to be $199.00 for 1,440 rounds of corrosive Czech ammo. Now, it's about $260.00.
IMO, the reason why there is such an abundance of the 7.62x39 ammo is that Russia and China are starting to stay away from this caliber in favor of the lighter calibers. They are cheaper and also effective.
The wise learn many things from their foes.
Samozaryadniy Karabin sistemi Simonova