Kelly Blue book prices are for cars not guns. S&W Model 57's are fine guns. You will be looking at $450 to $550 for one in excellent condition. Like mine a lot. The N-Frames are a bit heavy for fishing use unless you are on a boat. Around salt waterm, you may prefer a stainless version. You might be better served with a Model 29 (44 magnum) as shot cartridges are available for things like snakes and so forth. But, I still generally prefer the 41 magnums; just don't use shot. For a snake gun, 22's are always popular and effective. I fish and I shoot or kill no snakes now unless one bites me. They occupy an important niche in the critter kingdom.