20-60 or so
15-45 USD
20-50 USD
Try e-gunparts.com
No such weapon
Depends on condition. Range from 100-400 USD
About $150 if its in GREAT condition and has both the cylinders .22 and .22 magnum.
5-50 or so
50-175 USD
These range in price from 30-60 dollars.
Model 66 583-605
GUNPARTSCORP.com and JACKFIRSTGUN.com carry lots of parts.
Impossible to answer without detailed descriptions of ALL markings and features and who made it.