Between $250 and $350 for a decent one.
What you have described doesn't exist, so, it can't have a value.
Take it to a gunsmith and ask for help.
Open the action (like you are going to cycle a round) then pull and hold the trigger and bolt will slide out the rear of the action.
See the SKS Instruction Manual (link below). Note that the "exploded view" diagram is small and not easy to read, but the indexed list of parts below the diagram is normal text.
Go one the net and there are many sites that show the parts break down. The SKS is amazing firearm for the price and the 7.62 x 39 is almost as good as the much more expensive 30- 30
Right now, NORINCO (Peoples Republic of China) is the only current manufacturer of the SKS rifle. In the past, they've been manufactured in the former Soviet Union (Ivhesk and Tula arsenals), former Yugoslavia (Zastava), Romania, East Germany, Albania, North Korea, and North Vietnam.
Grab your riffle and run to the hills.You need to shoot that target with your riffle.
A Chinese SKS is really no different than any other SKS. The way to field strip it is to lift the small lever at the back of the dust cover and pull out the pin. The dust cover will lift off and the bolt and carrier will be accessible to be removed. Lifting the little lever on the side of the rear sight block will allow the gas tube and piston to be removed.
http://dictionary.reference.com/browse/riffle
how does a riffle beatle eat
Yes, bears have been taken down with much less powerful firearms, but the SKS is not a real good choice for this as it is relatively low power and only a medium caliber.