To me it's no trouble at all to spend five minutes modifying a perfectly good military mag to work even better. For $50 you can almost buy two Bulgie mags and spend ten minutes making them fit better than any mag you can put in a Saiga .223. The Galil's are even cheaper.
Saiga 30 rounders rock!! Nothing works better in your gun than a factory mag!! I don't mind paying for the real thing.