Well, I have a six inch Security-Six and I wouldn't sell it for less than $500 - and mine has had over 30000 rounds fired through it.
My gun is still a rock solid, tight locking pistol that is more accurate today than it was when I was using it in competition shooting steel chicken, pigs, turkeys and rams with it. It has out-shot and out-lasted a 9mm and a 45 Colt combat commander. I don't know what it would cost to duplicate - or if any of the present guns on the market could equal it - so I am going to hang on to it until I die and pass it on to my daughter.