Door Buster Mini-Event
During the Door Buster Mini-Event, you will be able to get guaranteed legendary items from the vending machines. This event will last from October 14, until October 21, 2021. The Door Buster Mini-Event is activated through a hotfix/micro-patch, therefore, you need to be online in order to benefit from this. Wait in the main menu until you see the hotfix applied sign on the pole behind your character to confirm the hotfix is downloaded.
Quick Vender Farming
Good vending machine farm locations are the Meridian Metroplex, Rolands Rest, and Boomtown. You got all 3 types of vending machines near the spawn. Therefore, you can quickly farm the vending machines, save&quit, and load in the map.