#15 Vending Machines
This one might seem strange at first, but let me break it down for you.
You can find vending machines online for a surprisingly cheap price.
After you purchase one, you can approach different businesses and discuss leaving your vending machine there for their customers or employees to buy from.
This benefits the business since they get a cut for renting out their space. And you benefit from all the foot traffic the business brings to your vending machine.
You still have to pay for snacks and drinks to go inside the machine. But since you get to set the price, you can factor in all of these costs and still make some steady passive income from your vending machine investment.