I've got a small track on the model:
Smith & Wesson 65 3 inch barrel. Revolver in .357 Mag. Blue Book of Gun Values (35th Edition) indicates between $400 in 95% condition and $475 in 100% condition for this gun. I have 18 recorded prices for this model gun from $458 to $740 over a period of 3 Yrs 7 Mos ending May 29, 2015. The average price as of that date was $593. No refurbs, no refinishes, regular sights. All represented as 95% or better. No distinction for engineering revision, if any, no special editions, no distinctions for box, papers, tools. Current or last MSRP is $563.
The last 10 prices I have for this model since 12/22/2013 range from $465 to $785 averaging $607. The average used price seems to be increasing. Surprise?
That's a pretty broad range but appreciate the data. Seems like our used-gun market is a little crazy right now, but then again, asking price in the ad can always be quite different than the final price accepted for sale.