Dealers are all different. That pair of K-frames was discounted $500 off the asking price, I just made him an offer for both. The CM .38 asking $550, I offered Five gunshow cash, he knew it was still a good price and he took it.
The last gunshow had a M&P Target .38, 1930's perhaps, asking $850, I offered the $600 I thought it was worth, he countered $650 and I walked away. I've even bought guns from Cabelas long distance at reasonable prices by making an offer after I knew they had it for several months. Both times they said no then called me back to take the offer.
Hearing about $350 M-18's has no bearing on what's happening in Montana or on the internet. And what a guy paid even two years ago for an early S&W .22 has no bearing on what they bring today. I see K-frame .22 as the currently most popular vintage revolvers, bar none. I've seen absolute junk at local shows and online auctions with $550+ price tags.
There are certain things I don't do: Reserve Auction, As Is No Returns or deal with a guy not shipping from an FFL. I have a license and only deal with those who do and acceept returns within a reasonable time frame. I offer the same when I sell.
I try to remind myself that they made tens of thousands of these guns and sooner or later I'll find a good one for a reasonable price and that will be good enough for me.
All that said, $700 is still high!
(Bob, I bought my first M-18 in the box at the Pueblo gunshow about 1976! I wonder what I paid and if it had a dash?)