I love registered and non registered magnums! I though I would never own one, and now, I have 4. Prices vary widely on condition, configuration, condition, originality, and condition. MY RMs and NRMs (1938-40) were working guns... all 4 of mine are LEO used--one even from the FBI. My best advice is to find a knowledgeable helper to give you a second set of eyes when you are considering a gun. The most expensive are high condition, all original and have a box. Less expnsive are the later guns that have been refinished and not wearing the original stocks. Even less expensive would be one with a shortened barrel or other mods.

This forum is an excellent place to start. As suggest above you might post a 'want to buy' listing in the classifieds section.

Good luck. Half the fun is in the search! I can honestly say I have never met a pre-war S&W 357 that I didn't like.

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Randy
Provenance nerd