So I just learned about this N-frame wheelgun, and how it chambers both 10mm auto and .40S&W (both with moon clips, of course). I then went to Smith & Wesson's website, but much to my dismay they have no information regarding the 610. When was this model discontinued? And if I were looking to purchase one, where would be the best place to look, and how much would they be worth (ballpark figure)? Thanks for any help guys.