Editing: Weapon Crate
The Weapon Crate is a friendly NPC at spawn. Interacting with him opens a small interface where you can pay $2,000 to open a crate. A row of weapon skins then rolls across the screen before stopping on a single weapon, which is added to your inventory. It's the in-game equivalent of a skin gamble, and prices and odds are fixed.
These skins are not part of the standard crate pool and are only available during events: