can i legally buy a national park service arrowhead logo bumper sticker, window decal, hat, or polo shirt?

Question

i can't find them in any nps bookstore.

Answer 1

Let me guess, the next thing you would do is paint your truck green right?

"Catch me if you can" anyone?

No you can't buy all of those things, probably can't buy any of them. Those are only for actually employees of the national part service, that way people can't impersonate them.

Tell you what, apply for a job there. Not only will you get them all for free, but you will get a paycheck too.