Depends on use- Serious target shooting? Plinking? Hunting?
100-300 or so
Yes, Ruger made them
50-200 or so
50-200
Ruger.
Ruger's web site has extensive sn data.
You should be able to find some of the resellers of ruger 10-22 magazines online at popular sites like ebay.
Depends on what caused the jam.
75-300
Check the receiver and barrel
Depends on the store.
it is worth ..............$$$$