I bought a Yugo that had almost zero rounds through it for $250 not that long ago. I don't think it's been 2 years but I could be wrong. It was from a lot that had a hairline crack in their stocks. Mine was almost impossible to find and I fixed it where you can't find it with some wood glue and a clamp. It was a 5 minute job to glue it and it sat overnight. Now it's as pristine as they get. I don't think it was ever put into service and I haven't shot it all that much. I just shot it enough to make sure it worked well. I doubt it has 100 rounds through it.
I bought it off the net. I still see them fairly cheap at times. I don't know about shipping to CA though. Some places just won't do it.
For example
Samco is selling the M59/66A1, which is a Yugo without the grenade launcher and some other improvements, for $380 but not in CA. Those are the same deal with the crack as mine was. Trust me, it isn't a problem. The M59 is always more expensive than the model with the grenade launcher BTW.
Or how about this. Classic Firearms has
Chinese "Chi-Com" rifles for $299. This is the place I bought my Yugo. I think they ship to CA BTW. Be aware that these are well used rifles and have the earlier rough wood stocks. They have been used. I've seen rifles from that batch in several places and they will definitely need some cleanup work if they're like the ones I saw. Still that's a decent price for a Chinese SKS if you ask me. I'm tempted to get another one myself. That place was great to deal with. They gave me a better deal than the web site offered when I called them to ask a question. It wasn't much better. I think they gave me the pick of 5 rifles without charging me for it or something like that. And again I didn't see anything about not shipping to CA. I even put in a CA zip code in the shipping estimator and it didn't complain about the address.
I would read the info on the condition of these rifles carefully though. They are not unfired Yugos like I bought. But the SKS is one durable rifle. And many people look for the Chi-Com models because they are all milled and they were made on the Russian equipment with help from the Russians who originally built the SKS rifles.
BTW I don't think I would pay $600 for any SKS. I'd prefer an AK-74 myself. They are better than the AK-47's from all I hear. Or better still I would buy a
Russian Saiga 7.62x39 for $480. That's more than they went for a couple of years ago but it's cheaper than most people sell them for. They can be converted to work like a really good AK-47 (not to mention considerably more accurate) for not a whole lot of money or they work just fine the way they come.