Gun shops, gun shows, want ads.
Yes
Yes.
No, the Savage Model 19 NRA has a unique bolt and there is no other rifle with a compatible bolt.
Yes.
Yes
yes, several models.
Yes you can put a bipod on any rifle.
Same as a man - humanely with a rifle or a captive bolt.
Yes
Yes, but don't use the original bolt face which came with the bolt and carrier if it's been used - get a brand new one.
Yes
Yes I have an original Geco Karabiner single shot bolt action 5 mm rifle. Model 1925 / S/N 14309.