you may want to buy from westrifle. they have really nice ones for sale I gather.
I have 2 sks and i only shoot corrosive ammo through them. I just make sure I clean them after taking them out for the day. not a big deal, I rather like the cleaning process as long as I have time for it.
sks is the next cheapest thing to shooting .22LR and I must say it's a lot more satisfying for me too. a bigger bang, some felt recoil and it's such a damned cool rifle.
you won't find a cheaper/better plinking gun once you step beyond .22LR imo.
my understanding is that any russian SKS made after 50 (read 1951 and newer) are ALL chrome lined.