I bought a LNIB 686+ (7-shooter) with 6" barrel a couple months ago for $350. Thought I got a good deal. The gun shoots like a dream (SA trigger excellent). I bought the gun off the internet from gunsamerica.com (these guys are brokers, but its organized like a retail store, not an auction).
Gunsamerica is good to survey market prices: its easy to do a keyword search for a particular weapon, and quickly compare prices. I just ran a search for "686", and got about 60 hits. Some have complained that gunsamerica listings are dated...that is, merchants aren't good about removing guns that have been sold. When I bought my pistol, the transaction went without a hitch, it was delivered to my FFL four days after I made the call. Worth checking out. Has anyone else had experience buying thru gunsamerica.com?