Jimmy,
I first saw the Ruger Security Six when I was 18 years old back in 1974. I really wanted one, but couldn't afford it. I tried over the last few years to find a used one - ideally a 4.0 inch barreled stainless steel one with adjustable sights, but a blued "beater" would also work. I just could not find one that met my needs. Finally, I found a blued steel 4.0 inch barreled Security Six with adjustable sights. I got the price down to $320.00 + tax and considered myself lucky. Shortly after, every time I turned around it seemed like someone had a Security Six that was in better shape and at a better price. One thing I learned that is important - be wary of the 150 series, which was the first model of this pistol. They modified the grip frame shortly after and trying to find original or after market grips for a 150 series is neither fun, nor cheap. I don't really regret my buy, that Ruger is rugged and accurate - one less gun on my grail gun list. By the way, many holsters for a K frame S&W will also fit a Security Six without any problems. Also, Safariland Speedloaders for S&W K frame revolvers will also fit the Ruger Security Six series as well.
Best of luck,
Dave