About $150-250, depending on condition, blued or stainless, etc.
125 USD
It all depends on the model, caliber and condition of the Ruger. If I asked what is the price of a used Chevy you would probably ask. Which one, how old, what condition, Which engine. How many miles? It's the same with a used Ruger.
Go to gunbroker.com look what they are going for...
75-125 or so
100-200
200-400 USD
50-350 usd
100-350 or so
100-1000 or more depending on specifics
Around $275-$300, depending on condition.
100-500 USD
100-500 usd