Failing Alfs advice, there are a lot of 4" revolvers out there for a reasonable fee. More .38 than .357, but they are still there. Things tend to be moving in the direction of either concealable or hunting/target when it comes to revolvers (not to mention more folks wanting pistols over revolvers). The 4", jack of all trades master of none, seems like the ugly duckling, even though its th most practical choice. Its not quite as much of a buyers market as the early '90s when PDs went semi and they were basically giving revolvers away, but its still a good time to be buying. Someone out there just got a CCW permit and wants a J frame or a Glock and will make you a deal on his GP 100. Just be patient. Just my .02.
FQ13