Heres a short track & Chart:
Smith & Wesson 36 1-7/8 in Bbl Revolver in .38 Spl. Bluebook of Gun Values (32nd Edition) indicates between $360 in 95% condition and $535 in 100% condition for this gun. I have 62 recorded prices for this model gun from $250 to $600 over a period of 3 Yrs 5 Mos ending May 16, 2011. The average price as of that date was $394. No refurbs, no refinishes, regular sights. All represented as 95% or better. No engineering revision, if any, no special editions, no distinctions for box, papers, tools. Current or last MSRP is $822.
Here's the Chart, three months and eight prices behind the data but you'll get the idea. The trendlines are for averages. The average price trend in may was about $440. I'm sure it's highe by now. Better examples of the model would command higher prices, especially with box, papers, etc