Colt did not make the rifle. Sauer made it for them.
Contact Sauer.
Price, the 92 costs more
You will have to call Sig Sauer to find out
I don't know how much exactly but a lot. The fact that it is from Sauer (now part of Sig-Sauer) and that it is a fine and now discontinued sport rifle will make it VERY valuable. Unless of course it is in absolutely terrible condition.
.22 Long Rifle - the Sig Mosquito
Try e-gunparts.com
10-100 USD or so
Try want ads, gun shows, gun shops.
No published sn data
100-500 USD or more depending on specifics
If you follow all the federal laws and have the money, yes.