Candy Girl Vending

is it illegal? anyone have any sources on the rules and regulations regarding buying sodas from retail and food chains for resell in vending machines? i want to know if it’s illegal. i know if you buy them from costco or sams club, it’s legal to resell. thank you!
mostly for convenience reasons. i always see my local walmart and target have soda sales that are even cheaper then what the manufactorer sells them for. it’s very complicated to get them directly from a manufactorer because you need a business office, and all we have is a storage which doesn’t qualify.
i appreciate both of your answers very very much… it is clear, however, which response is more defined. thanks you both, i’m very grateful for your time!

Snack Vending