Issue M9- $100
Issue M7- $25 (no sheath)
Those are the rough prices from most places, if not a little higher.
Which is why I recommend
www.dsgarms.comA new M9 through them is $87, while a slightly used M7 with new sheath is $14. Great guys to do business with, I know any time I think about bayonets they are the first people to jump into my mind.
Which one you should get depends on what you are looking for it to do. The M7 is still the best pigsticker in my book, while the M9 becomes more of a GP knife that happens to work as a bayonet.