There's already a few vendors that sell them, so I would venture to say yes.
Lock blades, but no auto-open knives, NJ law, I think. A few vendors have. The Army/Navy setup has used ones; there is a guy who does pocketknives and Airsoft pellet guns; and a nice guy named Bob who has knives, replica swords, and small tools (his wife's table next to him has dog toys and chewables).
You see them being sold but there are laws covering sales to minors, as well as certsin types of knives. The web gives lots more info on the subject.
Some vendors sell them
You can sell them
Yes you can
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