https://www.pcgamer.com/fortnite-vending-machine-locations/

That extra bolt-action rifle will cost you, but learning the locations of Fornite's vending machines won't. Introduced in the v3.4 update, they're are a new way to get geared in exchange for some fat stacks of materials. Fork over enough wood, brick, or metal and you'll get whatever gun is advertised (though you can also bash the vending machine with a pickaxe to change up the selection).