$300.00
400 USD
300-500
No such model in the S&W line.
100-450 or so
Around 300 dollars, depending on the buyer.
$500 for fair condition, $1100 for a new-in-box model XIX.
For the "standard" NEW Model (with transfer bar safety) Blackhawk in .357 Mag, current retail values range from around $200 in fair condition to around $480 in Excellent condition. If New In Box - $500 to $550. Be advised that there are a couple variations that can bring more value.
The cost of a 357 magnum revolver depends on many factors, it's condition, whether it's new or used, and what model it is. You can find them from 350 dollars upwards.
since you didn't give the condition of the 357 there are variables the easiest way to really find out is go on gunsamerica.com and search for it
bought this revolver today seems to be in great condition
300-500 USD or so