I own a .357 Python (blue, six inch bbl) that I consider one of the best hand guns ever made. I bought this from my uncle’s gun shop (in a time when he had a gun shop in his basement, by appointment) for about $400 in the mid 70s.
I have “retired” the gun because I have many others to shoot, (S&W, Glock, etc) and it is no longer in production. Values for a 95 percent Python at a gun show have been in the $1100-$1200 range. If you see one cheaper than that, buy it. Immediately.
I think I bought mine, a Cobra, in 1990. It probably has less than 100 rounds through it. Put it away after getting married and having kids and just getting back into shooting.