At the S&W Shooting Sports Center, the general pricing rule is 80% of list. For a 4" 686P, list price of $716, that would be $573 new. Some stores will indeed do better than that as well.
If it's in like new condition for $525, I don't think it's a bad price, but it's not a bargain. As tarpleyg suggested, you can always bring in your cash and make an offer. Storeowner may then choose to take the bird(cash) in the hand.