Depends on the exact model finish, type barrel and sights, atc. AVerage from a low of $100 for a well worn but shootable to about $350-$450 for slab barreled target model in stainless.
50-160
50-500 depending on EXACTLY what you have.
A call to Ruger will get you the answer.
50-200 USD
50-250 usd
50-250 usd
50-150 or so
10-150 USD or so
Depends on condition. Range from 75 - 165 USD.
50-500 USD
50-500 USD depending on condition and exactly what configuration.
$100-$300, depending on exact model and condition