GUNPARTSCORP.com and JACKFIRSTGUN.com carry lots of parts.
Try e-gunparts.com
20-100 or so
20-60 or so
About $150 if its in GREAT condition and has both the cylinders .22 and .22 magnum.
10-100
15-45 USD
10-80 USD. No published sn data.
Just bought one at a gun show for $ 140
10-30 usd
SN's were not required before 1968
Depends on condition. Range from 100-400 USD