https://www.pcgamer.com/fortnites-latest-update-brings-vending-machines/

You take one long weekend off work and return to discover there's a comet is hurtling towards Fortnite. Panic buying in the face of minute snowfall is bad enough—imagine how strapped for resources we'll be during an extinction event? Thank goodness Battle Royale's latest update welcomes vending machines.

In exchange for materials, vending machines promise "three different deals, rarity and items chosen at random," so reads update v3.4's patch notes. The machines will be scattered across the map with Common items selling for 100 materials, Uncommon for 200, Rare for 300, Epic for 400, and Legendary for 500 materials.