Pre'64 M/88's in .308 the asking price is around $800.00 +/- depending on condition.
A high condition M88, 308 with an asking price of $1,500.00 sold here in the Classifieds a month ago.
If I was buying I think 800 is in line. If was selling I know you can't get $1500 for a rifle if you are asking $800.
Just sayin