Level 1 stuff came in old days from locked crates and store.

Last locked crate that drops level 1 gears was rengol and all crates after that either don't scale at all or scale from level 2.
You can still get tokenized rengol crate for crate tokens from NPC in Garetta.

There's also npc just before Jarl in map 3 of brakenridge that sell a very basic pack of stuff that scales from level 1 to 10 I think that includes legendary weapon and armor.

To my knowledge these two are the only sources of level 1 gears still available in the game now. Other gears are just carried through ages by collectors.