The easiest vending machine to spot is found in the large front area of The Slums, down the stairs just to the left of where the Guardian robot stands at the broken elevator. It's right across from Morsuque the musician robot.
A second vending machine can also be found along the main alley streets. Take a right when walking down the stairs away from the broken lift where the Guardian is to pass by the Super Spirit Laundry shop, and keep heading down the alley past the neon yellow light where Seamus lives to a wall mural and Memory depicting the sign "RIP Humans". Just to the left of this memory is a white lit vending machine that holds another Energy Drink.
Once you climb to the rooftops above The Slums, head to the left from Momo's place towards the other Outsider home featuring a library. When you reach a couch and TV on the roof, look for a smaller roof below that has a red lit vending machine with another Energy Drink you can grab.
Not far from the previous vending machine, hop across the rooftops to where a robot is sitting by some metal kegs, and look into the narrow alley nearby. You should be able to spot a lit up vending machine wedged in a lower balcony, where you can gain another Energy Drink for your collection. You can also reach it by traveling from where you first entered the Slums to the fork in the road, and taking a left and jumping up by a bicycle.
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