That's a tough one. Too many variables.
Anywhere from maybe $400 for a newer one that is scarred and rough to as as much as $2500 or more for a pre-64 in excellent+ condition.
Good choice though. I have a ~25 year old .30-06 model 70 XTR Featherweight in .30-06 that I wouldn't part with.
History fails to record a single precedent in which nations subject to moral decay have not passed into political and economic decline. There has been either a spiritual awakening to overcome the moral lapse, or a progressive deterioration leading to ultimate national disaster.
If you think a strong military is expensive, think about what a weak one would cost