The following Vending Machine can be found at or near Anarchy Acres in Fortnite Battle Royale:
There is a wooden shack at the NE part of Anarchy Acres. The shack is boarded up so break the wood (or tear down the whole shack) and you will see the vending machine inside.
Another vending machine can be found at a junction of the road southwest, north of Loot Lake: