Iron filings in shot shells, iron-bladed knives, even something as simple as iron nails in your pockets, or tied by a cord as a temporary amulet kind of thing, bound to a fetish or a poppet. You can line the hem of a vest or jacket with iron filings, as well. Stealth-iron isn't hard to do.

Weapons are harder--iron's heavy, so lugging an iron-blade broadsword, not so handy. But yeah, prybars, tire irons, fireplace pokers, even shovels, all easy enough to do.

I vaguely remember (perhaps wrongly) from a C.J. Cherryh story where the steel weapons that were forged from iron were enough to hurt and wound and maybe even kill the fae.

Hey, I had a dream that I was in a Supernatural episode where somehow there was a flashback (ghosts. . maybe?) where we saw Giles' (I don't know why he was there - but wouldn't it ROCK?) - great, great whatever grandfather who was in an early 19th century British military uniform of some sort.

I don't think iron provides protection unless it's a sealed room, but it would be pretty easy to have all sorts of small iron implements one could use to temporarily dispel a ghost. A good old-fashioned iron wrench in someone's pocket wouldn't raise any eyebrows.

What's buckshot made of?

Apparently, buckshot is a size not a material - so it could totally be made of iron -- if needed.

Although, traditionally pellets (which are in shot) were lead.

Here is some iron shot.

They're phasing out the use of lead in buckshot for hunting, because of its long-term persistence in the environment, so steel and various alloys that include iron are widely available.

My wild-ass guess is that cold iron originally was seen as antithetical to the supernatural because it represents a creation of man rather than nature. One could propose a modern fae that could be killed with plastic or disco.

"Death by Disco!"--Sam, The Lost Boys.

Oh come on, I can't have been the only one thinking it.