Depends on the store.
$150-$200, depending on exact model and condition.
Yes, Ruger made them
50-200
Ruger.
Ruger's web site has extensive sn data.
75-300
Depends on what caused the jam.
Check the receiver and barrel
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.
50-225 usd
Not recommended.