I got mine from a reputable dealer. And I feel it was a fair price as far as I could tell from the market at that time. If you can inspect that gun and you are happy with the condition, I would think $400 is still a good price, but only you know how much time and effort it costs you to have $400 and what else you might do with it.
I don't know about older versions, but according to Savage the way mine is made doesn't allow the barrels to be regulated after manufacture, and indeed on mine they don't shoot to quite the same point of aim. If you can get a shooting trial of that one before you buy, do.