If you want an SKS in general, then yes, it's a good price. Comparing it to an AR isn't really valid IMHO. If you are just looking to buy a rifle in general the AR is a significantly better and more practical choice. A lot of times though you're buying something different because you want that item specifically. The SKS isn't just "a rifle" - a piece of cold war history.
They are not likely to ever get back under $100 again like they were. Years ago I bought a Yugo SKS for $90 that I later foolishly sold for $275. I just replaced it again with one of the $299 ones from Classic. While it's not in NEARLY as nice of condition as the one I got rid of (that one was basically unissued), I do like the Chinese configuration better - it certainly balances better than the Yugo did with that obnoxious grenade launcher attachment on it. Once they exhaust however many of these they have to sell expect prices to start creeping back up again.
They're covered pretty thick in cosmoline - the gun shop called ahead and recommended I bring a trash bag to transport it back out. Took me nearly 2 hours to get it fully cleaned up. As to condition - the wood has a lot of dings and nicks and is really dark in color. I may try to "sweat" some more of the cosmoline out later to lighten it, but for now it is what it is. No cracks or anything though. The metal - it's decent. The finish is still largely there, but there was a LOT of pitting on the receiver right below the wood line.. In that location though you can't really see it with the gun assembled. A bit of pitting and surface rust near the handguard and on top of the bolt carrier too (it looks worse in the pics below than in person - camera flash makes it more apparent).
I obviously didn't pay for a handpick, and it's a bit rough, but here are some pics of the one I got from Classic last week:
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