Value is driven by exact model (you did not say) and condition (you did not say). So we can't really say. It could be $100 for a well worn Mk1, or $450 for a like new MkII with a select barrel and sights. Stainless or blued also makes a difference in price.
Used from $375. - 469.00 with case 10 clip.
Average $200-$300. Spelled Sturm BTW.
100-375 USD
500 or so
A call to Ruger will get you the answer.
100-1000 USD depending on EXACTLY (OMBH, NMBH, Security Six, Redhawk, etc.) what you have and its condition.
If you mean a Sturm Ruger, about 300 USD
0-300 USD depending on condition.
ABOUT $200-$300, depending on condition, and WHICH version of the Blackhawk.
75-160 USD or so
100-300 USD or so
100-500 usd or so