The reason I'm wary about this is that every used revolver I've ever seen has been around the 400$ range.
I can see your point if this is the case. $400 is about what a new Ruger GP 100 would go for around here. You should look around other places for used guns. I bought a S&W Mod 28-2 for $250. A new S&W of any kind would probably run about $500 so I got it for half price. That's the kind of deal I'm talking about. The guy I bought it from also had a used Colt Trooper MkIII for $400 and it sat in the case for a loooooong time.