Not super cheap but the cheapest I've seen in a while
Vska 7.62x39 Blk/syn Stamped Receiver
The VSKA Synthetic is for shooters wanting a base model for customizing. Built with heat treated S7 steel carrier, feed ramp, front trunnion, featuring a carburized 4140 steel bolt and RAK-1 trigger group. Features a 1.5 mil stamped steel receiver, large T-shaped magazine catch, AKM-compatible...
www.smga.com