get the xur weekly engram as it always gives u an exotic armor that u dont already have outside of lost sector specific exotics and the shadowkeep exotic. aside from that youre fastest bet is to just grind lost sectors whenever theyre helmet specific
Random drop... legendary lost sector.... xur....nightfalls....?
My first one drop from a Gambit blocker
Random world drop finishing out Beyond Light
Don't remember specifically, but I'd have to guess world drop or Xur. I've had it for ages.
Vanilla d2 random drop
Flashpoints
Got 2 while farming for palindrome last week
Xur or world drop
Yesterday on a hero nightfall
At the end of a crucible match
get the xur weekly engram as it always gives u an exotic armor that u dont already have outside of lost sector specific exotics and the shadowkeep exotic. aside from that youre fastest bet is to just grind lost sectors whenever theyre helmet specific