so what weapon skins/armors are exclusive?

is it possible to get the sticker shock skins still?
and what can’t I get anymore armor/skins wise I just started playing last month on a new account I quit like 2 months after launch,
switched to PC and just wasn’t enjoying halo 5… but I am now so I regret quitting

I think a couple of the HCS skins can no longer be purchased, Sticker Shock skins can no longer be purchased, the Challenger armor set is not obtainable, and Oliver might not be obtainable. There might be others, but that’s what I remember off the top of my head.

Hcs skins I think.