Yes, one can own a bullet proof vest, unless they are convicted felon, or unless involved in trafficking drugs or a violent crime. I believe they do sell them, along with pawn shops, gun shops as well.
To my knowledge bullet proof vest are iilegal to civilians. Check your local law
If they have bulletproof vests, I do not know how much they cost. an approximate 60 to 100 dollars
Thanks! Your answer is awaiting moderation.