I have a small track on the 3-in Model 65. Not enough for a trend but the average is probably reliable for the time period.
Smith & Wesson 65 3" Barrel Revolver in .357 Magnum,.38 Special, Plus P. Blue Book of Gun Values (33rd Edition) indicates between $300 in 95% condition and $400 in 100% condition for this gun. I have 8 recorded prices for this model gun from $435 to $668 over a period of 1 Yrs 9 Mos ending July 15, 2013. The average price as of that date was $555. No refurbs, no refinishes, regular sights. All represented as 95% or better. No distinction for import location or engineering revision, if any, no special editions, no distinctions for box, papers, tools. Current or last MSRP is $563.
I found this one in November 2012.