$150-$200, depending on exact model and condition.
Depends on the store.
Yes, Ruger made them
50-200
Ruger.
Depending on what variant, new or used, etc.., it can range from 75-300 USD
Ruger's web site has extensive sn data.
Depends on what caused the jam.
75-300
Check the receiver and barrel
$50 - $250, depending on new or used, specific model, and overall condition.
I think the average price for a Ruger 10/22 is around $200. They are really fun and probably the cheapest gun to shoot with the current economy. I have one and love it. They are also probably one of the most customizable firearms out there.