Not a big fan of Putin and his new war, but I have no issues with Russian ammo. I figured that with no more being imported that I would dig around for a new source. The price on 7.62x39 is crazy right now.OP, the Arsenal (Bulgarian) stuff is G2G by all accounts. I don't have any yet but everyone I know with it likes it. Bonus points for the sealant.
ZSR (Turkish) chronos a bit slower than most other x39 options out there. It's also mild steel core, so you're not going to be able to shoot it at as many places. There is also some evidence it has corrosive primers. No big deal - rinse the internals with a bottle of water and chase that with a few rounds of non-corrosive to dry everything out.
A ton of nations produce 7.62x39, including the U.S. Getting them here is sometimes a different story, but there are plenty of options.
Russian stuff is still available all over the place. Are you having trouble finding it, or are you taking an anti-Russian stance? Check Ammobot. And it's worth remembering that although Chinese ammo has been banned since 1994, it still pops up for sale all over the place. The same will be true with Russian ammo for a very long time.