Charlie, I've been looking for a 66 also but the 4" . Price range sounds close to what is around here in Tx. 1st. issued in 1970 then with a series of dashs, discontinued in 1993.
actually I have found a couple of 66's ($325) with the 4" and just need to commit, first one must be the the pinned and recessed.
one was apparantly a model with no dash and the other one appears to be the last model with 66-6 ($395) when you see and swing out the cylinder.
Then the same store has brand new looking 686 7-shot and 5" barrel ($400).
I had the .44 mag Taurus blue with 6.5" and shot it in big bore matches, it shot pretty good and have since traded it for a Ruger Vaquero and now want a .38 to shoot out to 25 yrds.