Yoo-hoo, out there....
HASN'T THE PENNY DROPPED YET??????
Why are you still dependent on commercial sources for ammunition?
We hear all these moans of anguish, every time some sort of "shortage" arrives. Why not DO SOMETHING about it? For the cost of a couple of cases of this mil-surp and/or second-rate crap, you could have the wherewithal to set up a handloading operation. And, for REAL independence, a few bucks more will see you set up for bullet casting, too.
A mould, some old wheelweights, a few pounds of powder and a few thousand primers, and you will be able to shoot regardless of the ammo supply situation, and yes, this includes 7.62x39 for the SKS and AK. Not only that, but the 7.62x39 runs at FULL power with cast bullets very nicely indeed, and more accurately than with the service ammo. So you need Boxer-primed brass....so what? You'd most likely lose it in the weeds before it ever wears out, meaning ten or more reloadings on a single cartridge case.
It's not difficult, it doesn't take up much room, and if you are one of those who "doesn't have TIME", I suggest you may need a new set of priorities. You won't save money, because you'll shoot more when the ammo costs less. You will expand your enjoyment of the hobby, and also your knowledge of how things work.