European surplus mags. I'm trying to remember where I got most of mine. Usually about ten bucks tops. They work great.
Someone was selling a bunch of 'em last year or two. Can't remember the vendor though....anyone know?
But for a 7.62, there is no reason to be paying more than about ten bucks a mag.
G19 G26 G30 Sig 2340 357 Beretta U22 (kid's) Two Saiga 12 Two Draco 7.62x39 "pistols" Colt 6920 Saiga SGL21-94, M92 Krinkov "pistol," PSA Patrol Carbine Saiga 223