50-380 USD or so
300 USD
Yes
$350-$400
Assuming very good condition, a blue used Vaquero goues for $300.00 - $350.00 around here. I bought a pair of blue 5 1/2" vaquero's a few years back for $500.00 for the pair.
175-350 USD
About $400
100-500 USD depending on specifics
The Ruger website, if up, has sn data
200-400 USD
50-400 USD or so
100-500 or so