Depends on make, model, etc. You could have a Ruger GP-100 for around $400, give or take, or you could buy a Korth, which will set you back well over $1000, even $2000, depending on variables.
75-260 or so
$100-$300
Depending on condition 150-300 USD.
100-300 USD
200 or so
100-300 USD depending on condition.
It is a revolver. Value about $250, depending on exact model and condition.
$100 - $500, dependent on a number of factors not included in the question, such as specific model.
100-400 USD
100-400 or so
Ruger's web site has sn data. 75-160 USD or so
Its a pistol. More specifically a 6-shot, single-action revolver, made by Sturm Ruger and Company.